Berean Standard Bible (BSB)
So Peter followed him out, but he was unaware that what the angel was doing was real. He thought he was only seeing a vision.
World English Bible (WEB)
And he went out and followed him. He didn’t know that what was being done by the angel was real, but thought he saw a vision.
Strong's King James
And{G2532} he went out{G1831}{(G5631)}, and followed{G190}{(G5707)} him{G846}; and{G2532} wist{G1492}{(G5715)} not{G3756} that{G3754} it was{G2076}{(G5748)} true{G227} which{G3588} was done{G1096}{(G5740)} by{G1223} the angel{G32}; but{G1161} thought{G1380}{(G5707)} he saw{G991}{(G5721)} a vision{G3705}.
The F.O.G *
(9) He went out following and he didn't know that what's being done by the messenger-angel was real but thought he was seeing a vision.
The F.O.G Message *
Young's Literal Translation
and having gone forth, he was following him, and he knew not that it is true that which is done through the messenger, and was thinking he saw a vision,