Been a wonderful flurry of fixing this last day, including a few extra scripts to show how you can create player shield energy which protects the players own health when damaged, and also shows how you can protect an entity from damage if they are attacked by a specific weapon. A sample level has been created called HealthTypes.fpm and will show both of these techniques, giving you both an Uzi and some Stones, but only let you explode the barrel full of fuel with the Uzi and never the stones, no matter how many you throw at the barrel. I added the Zombie for comedic effect, but you could do the same to him as well with the same technique.