I thought this would be obvious, someone would just pass out and go floppy. However last week during rolling I got someone in a sleeve / Ezekiel choke while in my guard and he didn't tap out. He started making odd faces, eyes wide open, and twitching and grimacing, muscles seemed locked in place, and I thought he was just resisting and powering through, So I continued choking, then found I could just easily sweep him. Still choking him while on top I suddenly figured something was wrong and let go (this all happened pretty quickly really < 30 seconds). He lay there with face twitching a bit with eyes wide open....Took him a few moments before coming around again and he had no idea what had happened and had gone into dream land.
obviously I didn't really expect someone to go out like this, so, my question, what are the signs someone might of lost consciousness while being choked?