Heero Yuy self-destructed his gundam. Lady UNe was crazy in this episode. She was going all out on the 4 gundam pilots(and the gundams). There were abushes galore in this episode and this is a fine example why I bother watching this series.(Or re-watching). Lady Une wanted the gundam pilots to surrender and hand-over there gundams. Dr. J said he surrenders but he's not handing over the gundams and that was the singal for Heero to self-destruct. Hes presumabely dead.