Small potential improvements for Overcharge RGM

• Give the air vents a cooldown
• Give vision of the individual attacking a droid provided it drops below 50-30% HP or upon destroying one (promote more interaction)

This would prevent people from abusing hopping between vents, and would make hiding among the many fog-of-war areas more difficult; pushing for more interaction on the map.

Although the latter could make it more frustrating to play against the mobile carries.