I've got a counter as an energy bar. While overlapping actives with "enemies" as a qualifier I subtract 1 from the counter. Unfortunately this is rather too quick and the player looses all lives very quickly. So I used a timer in the same event. Every 1 second subtract 1 from the energy counter. This works better but it's possible to collide with an enemy and not lose any energy (because the collision occurred between seconds).
How do I slow down the subtraction from the energy bar counter without using a timer then?