You've really got his goat, and his already poor syntax degenerates further. "Gort crush elf!" He takes a running leap off the cliff, effectively charging on a leap attack.
jump - (1d20+10)[12] DC 15
if jump is successful, take nonlethal - (1d6)[3], add (1d6)[3] lethal damage if unsuccessful. Also, he doesn't get the +2 charging bonus if he doesn't land the jump, so subtract two from his attack.
attack - (1d20+14)[19]
damage - (1d8+7)[14]