or not?

Was playing two-headed game with red white deck as a sidekick, me with usual black green one with stripped down to 275 cards or so.
Well we were down in the point where our opponents had this new landfall thingy going on where they put a 4/4 beast on table each time they get a land on table. And by the looks, there was lots of lands coming.
Well they were laughing and pointing at us that we lost as my partner had nothing on table and i had only 1/2 & 7/7 creature + one card in hand. As said, he had nothing on table and two cards in hand.
But.
He had not used any of his mana nor were the cards in hand creature cards.
So just before his untap phaze he dropped hefty 30 points of damage on opponent. Too bad they had only 16 left.