Terror units don't run or hide.
melee units prioritize the closest tile to themselves

rather than trying to walk around to the east
melee units will still pick targets, even if they can't move.
units that were shot will turn towards their aggressor
reacting units don't stop turning when they react
don't charge aliens for turning when shooting

stop charging them more than we should
don't end the alien turn (or worse) when aliens use aimed shot
stop dead units from still seeing the unit that killed them