If you stand on a grenade, you don't die.
See picture, smoke shows where the grenade went off.
EDIT: The init code i was using had allowDamage set to false, which i realised today (someone had asked me to use that to test another issue).
However, even when set to true, i didn't die, though i did take a lot of damage.
I tried again after using a first-aid kit, and i died. {F21759}