For one thing, it would make people more cautious with grenades. I defend grenade spamming because it is a good (and realistic) tactic. But you should not only get whacked by your own nades, but by any nade.
In the end, for me personally, it's more of a challenge. But I guess I'm challenged enough right now just trying to port this crazy thing....
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"If your philosophy does not produce corn, I don't want to hear about it." - Red Bear