As video itself provide well explination, if you look closely i never intended to throw grenade near me and i know the area of affect of grenade and i know how not to get any damage by explosions by jumping and stuff also one of my nade touched your body and it moved along with in your direction and i wanted to throw it the other side but your body made the grenade fall in the wrong direction and i got stucked in between em' sadly xd
Also the area was very little and conjested and possibilities of these cases occus,so all this is my explination which sort out the case i guess.
Cheers!!