Acts 12 16
Peter continued knocking. When they did eventually open the door, they saw it was him, and were totally shocked.
Compare with other 3 random translations
EAS Acts 12:16While all this was happening, Peter was still knocking at the door. Then someone went and opened the door. They were all very surprised when they saw him there.
NKJ Acts 12:16Now Peter continued knocking; and when they opened the door and saw him, they were astonished.
ERV Acts 12:16But Peter continued to knock. When the believers opened the door, they saw him. They were amazed.