Basically, (in my opinion) if you are recharging encounters powers for the monster, you should also recharge action points.
A monster is rated based on its potential threat level to the PCs level. If you take away its action points for an encounter with it, it is not the same level of threat it was rated to be.
Or, for a less opinion based response and more rules-oriented response, I'd stick with what ExploderWizard said ...
PCs are basically a bunch of uber creatures. The monsters survived to tell the tale (even if that survival is just for 5 minutes while the PCs rested on the other side of the locked door) -- so it's a milestone for that creature.
A monster is rated based on its potential threat level to the PCs level. If you take away its action points for an encounter with it, it is not the same level of threat it was rated to be.
Or, for a less opinion based response and more rules-oriented response, I'd stick with what ExploderWizard said ...
Use a simple rule for monsters. If a monster encounters the PC's and lives to talk about it, then it counts as a milestone.
PCs are basically a bunch of uber creatures. The monsters survived to tell the tale (even if that survival is just for 5 minutes while the PCs rested on the other side of the locked door) -- so it's a milestone for that creature.