Grid the landscape, and shortcircuit checks on the collision array if there are no nearby checked in collisions to be collided with. This is a big win for fire's ammoshove in particular. Also add a +2 that seemed missing in the check, and update fire accordingly.
Revert most of optimisation except for some obvious fixes to errors someone or other introduced.
Something in the rest appears related to a crash in translation. Until I determine why or what, this stays out to not ruin people's games