Normally a gate requires someone to pull or push it. In this case, the gate simply opens without the aid of any man. This detail, together with all those that come before it, serves to emphasize the miraculous nature of Peter’s escape and the fact that he was passive throughout it.1
10 When they had passed the first and the second guard, they came to the iron gate leading into the city. It opened for them of its own accord, and they went out and went along one street, and immediately the angel left him.