How did this guy did 25k dmg in COM explosion?

https://www.youtube.com/watch?v=lHDTV7N8mwI

32:10

Um, sera acu did ctrl-k (aka suicide) and killed transport with acu. That`s all

ACU without base, that was on transport, had lazer. So the ACU on ground thought that he is dead anyway, as other would catch him with transport, land, kill and survive. So the ACU on ground ctrl-k'd, killing himself, and explosion killed transport, which killed lazer-ACU.