If a unit is in overwatch and an enemy moves a single step from a tile outside of the unit's vision to a tile inside the unit's vision, will overwatch trigger? How about the reverse - if an enemy moves a step from a tile inside the unit's vision to a tile outside the unit's vision?
If an enemy is on tile A and takes a step to tile B, and unit gets an overwatch reaction shot against it, does the game use the cover status in tile A or tile B? i.e. if an enemy is in full cover and I think it is likely to move next turn (Stun lancer, e.g.), would it be better to overwatch instead of take a shot, or will the shot consider the enemy to be in full cover anyway?