Should not be trying to control it, he didn't get his feet sorted quick enough so has to let it bounce and then fight for it. Trying to control it made the situation worse. That channel between him and Tomi is where Liverpool got a lot of success in the first half. With Gabriel when he makes a mistake you can see he gets rattled easily, I think he plays with his heart on his sleeve.
Also just seen the handball incident, that is never a penalty. His arm was a bit out but he has no time to react.