He would've seen the images of Marinakis berating Nuno Espirito Santo on the pitch before firing him not long after, and the swift way in which he dispensed with Ange Postecoglou.
Karma for Marinakis?
Given Forest's current position in the Premier League, the 54-year-old manager might even have to conclude that he left the owner with no choice other than to sack him in the aftermath of a disappointing 0-0 draw with basement boys, Wolverhampton Wanderers.
And yet, Marinakis now looking for a fourth manager this season, and with one of them in Nuno, having guided his West Ham side to just three points behind Forest after a slow start, some might say it's karma.
Indeed, there have been nine permanent Forest managers whilst Marinakis has held the keys to the club, and Dyche actually had the best win percentage of 47.1%.
He was even nominated for the Premier League's Manager of the Month award as recently as last week, so the immediate demands that the owner seems to place on those working for him, from the outside at least, appear unrealistic at best.
Reminiscent of the Pozzo ownership at Watford
In many respects, the gung-ho nature of his ownership is reminiscent of the Pozzo family at Watford.
Since 2012, when they took over the Hornets, and up until Tom Cleverley was sacked at the end of last season, Gino Pozzo had overseen 21 managerial changes in just 13 years.
Is it any wonder, then, that both Watford and Forest are struggling because of that lack of stability?
How many times do incoming managers at any club espouse in interviews that they need time to turn things around and to implement their way of working?
That simply doesn't happen overnight and will be 12-18 months - at best - before their labours bear fruit.
Unfortunately for Dyche, that type of grace period doesn't appear to be part of Marinakis' thinking, and maybe the manager didn't help himself when all is said and done.
Was Dyche to blame?
Forest had 62.9% possession of the game against Wolves, but couldn't convert it into a game-winning position.
That was the 10th time that Dyche had managed a side in the Premier League that had at least 60% of the ball, and then didn't go on to win any of those games (D4 L6).
Prior to the game on Wednesday night, there was definitely a sense of foreboding in the manager's tone, too.
"The owner has been fair to me, without a shadow of a doubt. If anyone chooses to change in football now, that's their decision. We've all seen it. Unfortunately, it is the way it is," Dyche said.
"The demands are high. Social media is playing its part now. There seems to be a lot of anger and resentment - we have got to roll with it. That's what we managers have got to do.
"People can demand change, and if the owner wants to make a change, then that's up to him, and that's the way football is now, that's just the reality of it. I understand the noise here has changed significantly since the last few games."
35 attempts and no goals
Forest then went on to have 35 attempts on Wolves' goal without scoring, which included failing to make the most of a six-on-one attack that appeared to infuriate Marinakis further.
The question is, who would dare take charge of what is clearly a poisoned chalice at this point?
Whoever actually does take the job will be breaking a Premier League record, as no club since the English top-flight's rebrand in 1992 has had four permanent managers in the same season.
You'd think that would be a huge embarrassment to Marinakis, but he's also the man who went through six managers in 16 months at Olympiakos: Carlos Corberan - 48 days, Michel - 194 days, Jose Anigo (caretaker) - 88 days, Diego Martinez - 157 days, Carlos Carvalhal - 65 days and Sotiris Silaidopoulos (caretaker) - 3 days.
Is Vitor Pereira the right man for the job?
Apparently, talks have already been held with former Wolves manager Vitor Pereira, and there would appear to be a good chance of the Portuguese landing the gig.
Against the odds, he kept Wolves up last season, and that can be his only brief from Marinakis now.
Things are so desperate for the Tricky Trees that the style of football shouldn't even matter at this point. All Forest need are points on the board to keep West Ham at bay and at arm's length.
In all fairness, however, that's all the three previous incumbents have needed to do all season, but at any sign of danger and a loss of form, Marinakis can't help but react.
Pereira's record at Wolves spanned only 38 games in all competitions, only 14 of which he won, six were drawn and 18 were lost.
50 goals scored, and 59 conceded in those matches is far from impressive too, and when his win percentage of just 15.4% from earlier this season is taken into account, it doesn't really show the 57-year-old in the best light.
However, needs must, and if Pereira can pull another rabbit out of the hat like he did last season, don't be surprised to see him sign a deal in due course.
Don't be surprised either to see him sacked before the end of the season...
