been done before, but I think the sound effects sell this version. created by a light-controlled-liquid as is usually the case. shots disappear when you shoot it though. I thought about creating custom invisible monsters with a custom "forcefield impact" blood splash and sticking them in front of the field, but then you can't turn the field off with a switch. or rather you can, but it doesn't make sense anymore. you could crush them with a platform, but then the player has to be way off in another room when it happens, which limits the usefulness. I couldn't figure out a good way to get around this whole problem.