To instinctively react to something, you still need input.  Gonad is not psychic.  The only input he has is noise, from all directions, until the attacker is in view, period.  He doesn't know where the attack comes from and you did not even make any indication to ME, the player, of preparedness in your turn.  He was prone and doing nothing, physically.  You were suppose to react [i]last turn[/i] and you did not.  You declared nothing and your character had no idea what was actually going to happen.  You can certainly [i]react[/i] to something that is suddenly THERE, but since you didn't know what was going to happen, can't make an intercept properly.  The Trygon, meanwhile, can SEE Gonad, and is a fast-moving being that you would NEED to see or hear properly in order to intercept, assuming no extra-sensory perception which Gonad does not have.

Speaking of instinct, you don't get to say that the actions of the Trygon to transform and leap into attack are not well-honed and as second-nature as breathing.  It's a bloody killer that has clearly done this often.  In fact, with the race knowing little else in life, this kind of practice becomes more intrinsic to its being because it's got the back of a predatory species in its head.  Let us not forget that the entire point of its actions were to hit-and-run [i]because[/i] it felt beforehand that Gonad was potentially dangerous.  He just didn't DO anything.  And you didn't tell the player and the audience he was doing anything.  You did this, and then you proceeded to tell me how my own fighter worked as you auto-hit, with knowledge of anatomy Gonad doesn't have and I doubt he could target from where he's lying even if he had.

And just to Devil's Advocate here, if you really did stop the creature's momentum with this illegal action, you'd be preventing it from using its legs to pull its claws from Gonad's body, and thus it would be rupturing several organs with its long and dense saber-like bone-claws as it thrashes in a total frenzy.  Since I specified the stomach, the claws would thrash around without bones to impede them, tearing through multiple organs that are necessary for life, as it would even enter the unprotected chest cavity.  You'd just die.

Either way, I'm not pleased with your actions.  They were too late, and you tried to conceal them like a guy cheating at poker with aces up his sleeve, and they were frigging auto-hitting.  You are out of order, and I will not budge on this.  Get out.