Rebounding grenade damage

[ifurin]

one of my players wanted to bring this damage rule from another game system. the problem was you practically needed to know calculas to figure out the damage. so this is what i came up with, what do you think?
Explosive rebounding: if a grenade is thrown into a small room or other confined area the GM may decide that rebounding rules apply.
If the explosive radius is larger than the longest side of a room then rebounding rules come into play. If the GM decides to use rebounding take the dice rating of the bulkhead, in character scale, and re-apply that back to everyone in the room the rest of the damage is applied to the wall/bulkhead. The rebound rule is only used once, if more damage is added, because of additional range, this damage is applied to the wall and not rebounded.
Eg: A character tosses an energy grenade into a room. (radius= 0-2/4/6/10 damage=5D/4D/3D/2D) The room is 3x5 meters with standard metal walls, roughly 3D body. The GM decides that rebounding will occur so he looks at the longest dimension, 5 meters, and rolls damage for 0-2 and 4 but adds 3D (the walls body) to each roll. The damage for the 6 and 10 against the walls only, this damage will not rebound. So those in the 0-2m radius will take 8D and those within the 4m radius will take 7D of damage, and the walls take 5D of damage.

[masque]

If it's a fragmentation grenade, I could understand why a rebound would come into play. I don't see what is there TO rebound if it's an energy-based explosive.
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[Esoomian]

[vong]

[Tupteq]

I'm resolving such things individually. For example shrapnel of frag grenade will not rebound if walls are rather soft (plaster), they will penetrate. But the situation is completely different in room with durasteel or metal walls. I'm using common sense here (+0 for frag and plaster, +1D for room size close to blast radius, +2D for small rooms - let's say < half of blast radius).
The other thing is the grenade explosion in tunnel. It's blast radius (it's not radial anymore) may grow significantly, common sense is helpful here too (x2 big tunnel, x3 for small - like 2x2m tunnel, x5 or more for ventilation shaft).

[garhkal]

Good point... Also, what about someone standing inside teh doorway to a room where a grenade goes off. Would his 'dodge' be hampered?
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[vong]

I dont think so, it may even get a bonus, because he just needs to dive back at an angle to be free of the blast..
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[ifurin]

we usually modify the cover rules and concider the person 1/2 covered and give them +2D to dodge instead of the normal modification to hit.

[Esoomian]