Ah yes, I remember using the radio near the… examination room I think it was, to lure him in and then lock him, I’m not sure if he could actually hear the radio but I locked him in anyways, but then he appeared out of nowhere on the other side of the map, scaring the hell outta me
Akers can only be trapped for a short while, he'll eventually escape using an ability called "stalking mode", where he essentially despawns, before reappearing near Simon a short time later.