Where's his damage?

Death recap only shows you the highest (I believe) three sources per champion. 1031 of the 1289 damage is accounted for in that screenshot, leaving just 258 damage unaccounted for. That could easily be a minion hit, a Yasuo E, and an auto-attack, or runes, provided none of them dealt over 122 points of damage.

Edit: Yasuo was running Electrocute, which would account for part of that, and an E seems reasonable for the rest.

Nerf Refillable Potion