It's been confirmed in the current X-Men run that Vulcan survived his fight with Black Bolt which had him tank a full on scream from the King, then while still recovering from that(was reforming his body from ambient energy around him and looked like a zombie) he survived a bomb that tore time/space/reality like tissue paper. That made me think of this fight here.

Fight 1: Vulcan vs Mongul Jr

Fight 2: Vulcan vs Kilowog