I know your angry that Laharl beat him but that's no reason to spell his name wrong
Also Last Stand doesn't trigger when you jump over the HP before it can be triggered.
Lets say Laharl triggers it at 500 Hp and fights Belgarad
Laharl has 541 Health left and Belgarad hits with a 561 Hit he jumps over the Last Stand trigger and beats him, Last Stand won't trigger if you jump over it so he doesn't heal another lets say 400 aditional Health and gain a couple of attacks.
Something else that nullifies Last Stand is if it goes off due to bleed at the start of a round.
If it does due to bleed at the start of the round the gladiator will get the health but wont get the extra attacks.