The Rovers manager was a constant thorn in the officials' side with his jack-in-the-box antics on the touchline but admitted he didn't see the red card incident.
Speaking after the game Bowyer said: "I've not seen it again and I didn't see it in real time. I didn't know what he got sent off for and as he came off I asked him what he did.
"I have to be honest I didn't understand him with the answer he gave me so I need to go and see it.
"It changed the course of the game because up until then we were very comfortable. We were pleased with how we were playing and we're disappointed to be leaving here without taking something from the game.
"Once the referee makes the decision there's an hour to play and our lads were magnificent."
Hanley is now likely to miss three games for violent conduct as the red card was for an elbow.