...But what is the winning condition, though? In SBA, a winning condition would either be killing, incapping, etc... but what did Sans do, exactly? The system treated it as a win, that's nice and all, but what did that do to the opponent? The System considering it a win doesn't really matter much if it doesn't do anything to the opponent for it to be a viable win condition (again, incap, kill, whatever).
You're also saying that the opponent would leave, and that somehow means... Sans has won? Even though the System didn't really do anything, and Sans left under the assumption that he has won, but in the end, by the SBA, it is still a loss, since he left the battlefield first and did not achieve the winning conditions required to win a battle.
Like sorry, but I'm just at a loss on how this could ever be a winning condition.
OMG, not this again. Can we please drop the “Undertale is a game full of mechanic, we don't know how it applicate outside of it!!” kind of argument. I'm genuinely tired responding to this.
We already accept the mechanic as a canon fundamental aspect of the game, and it can be used in a crossover matchup under Verse Equalization. The game even further reinforce this by the fact that most of the residents of Undertale do fight normally. Just that someone who has knowledge over something higher than them (such as the system) can exploit this into their winning condition.
Take Sans for example, he acknowledge that he can “dodge” Frisk's attack, and we treated it as something special in the game. Even though lore-wise, they can dodge normally just like any other fight. Sans's awareness of the system just makes him more invulnerable in this case. Because he can avoid the system's unavoidable attack. The same goes with “turn”, they don't see it happening in real time, but it's there and it does have effect over the fight. Sans know this, and thus have any advantage.
What are we doing, man.
....? Habibi, I did not mention any of that, don't put words in my mouth. I said if Alice would be able to move or not DURING the attack, because I did not know enough about Undertale anymore and would appreciate some info on it, not “Undertale is a game full of mechanic, we don't know how it applicate outside of it!!”.
Furthermore, this... doesn't really answer my question? I know the system exists, I know it is applicable, what I do not know if that means any character would not be able to move WHEN Sans attacks or not, ie in his attack mode where he does all the telekinesis shenanigans since he targets the soul and whatnot. Frisk was able to move, but I do not know if that translates to every character outside of Undertale being able to move during the attack.
Though, I am sleepy, so maybe I just didn't comprehend what you said correctly about the System being applicable to crossover characters.