I agree he was in the wrong, and should have left the perfectly capable admin Empty to handle his own stuff, HOWEVER a first offense of burning a player, for 5-10 seconds, and not DIRECTLY being the cause of the death, will most likely merit nothing more than a warning to use commands sparingly and appropriately (and not take the initiative in another admin's business).
My advise would be to keep a record if he does anything more, but you need substantial evidence to gain a substantial response =\