Early into the Gunners win, Deeney was sent off for an elbow on Lucas Torreira and exchanged words with Emery as he marched down the tunnel.
"I didn't see the red card," said Emery. "I leave the decision for the referee. It's clear it helped us, with the decisions, because we played with one more player from then on. It's more difficult for them.
"But our goal gave us the advantage in the first half and after the red card also. It helped us to take more control of the game, but we didn't do all we wanted to do. But we can be happy with the result, because playing here is very difficult.
"I don't know. Only that. It's not important. I didn't listen to him really. I didn't listen to him really and I only answered him to say I don't know."