I was experimenting with 'Silence' yesterday, and found some... oddities. I'm not sure if it's working as intended. Maybe I'm wrong, but this struck me as weird!
1. I cast the spell on a hostile PC. They rolled their save against the silence, but I got silenced, and... vanished. They could not see me at all: not half-visible. Just gone. I could see them.
2. I cast the spell on myself, and the same thing happened: I vanished, as far as the other person could tell. They were not hostile this time.
The description says the spell eliminates the need for MS checks if that has something to do with it, but my character does not use stealth, and was not in stealth mode.
I'm going to try using it to run past some hostile NPCs and see what happens. It would be weird if it was functioning as a pseudo-invisibility spell/sanctuary.