Make the fragments bounce faster off walls but disappear very quickly, within a second or so. Then it covers an enclosed space immediately and outside areas less effectively.
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with real frags, dose the shrapnel NOT imbed itself into walls, floors ect?
but it is all plastic, and this is blockland, so it wont look to out-of place.
but we do need a grenade like this, you ever tryed to get away from a HE grenade with nojets? if its a nice throw, you are likely doomed