Creatures died when they shouldn't have
Alchemy
He had a 8/8 Celebrity Fencer and 6 mana that was all tapped
I blocked with the Spider Broodmother (3/5) and a Drider enhanced by the Broodmother (5/5).
No additional spells were on the stack.
He killed them both.
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Muggle_of_the_Coast#19144 commented
Assuming your opponent assigned blockers correctly (the Broodmother first), this corresponds to what should have happened. In full detail:
Your opponent assigns 5 damage to the Broodmother, and 3 to the Drider.
The game checks to see if creatures are dead. The 3/5 Broodmother (with 5 damage on it) dies, the 5/5 Drider (with only 3 damage on it) is okay for now.
The Broodmother goes to the yard. The Drider is now a 4/3.
The game checks again if anything is dead. The Drider (which is now a 4/3 with 3 damage on it) dies.