Explosions and Containers

[Glamurio]

I could see the person inside of a locker that's hit by an explosion to be hit by shrapnel that's breaking off the locker itself, kind of like being hit by a slamgun. Perhaps it's as simple as introducing a "broken" sprite for lockers, once they break they launch nearby shrapnel. And if they suffer more explosive damage after, the locker gets fully destroyed.