I realized that swapping mechanics allows one knock out 4 dinos.
the 3rd tries to swap out and gets hit by a swap prevention attack, then the game doesn’t stop there, but allows all things happen. so the 4th enters and gets hit by some attack too and is knocked out.
i always said a swap move should only happen if necessary. the bizarre behavior was when dracoceratops used to enter and hit the air, but nowadays this thing evolved and we have a 4-0 lol.