Well this sounded like an obvious question and maybe it was pretty obvious if you knew a little latin. It seemed like the spell revealed if and living humans where in the area. Yeah. That sounds good enough.

"Homenum Revelio reveals if any living humans are in the area and you can use it if you have lost anybody, during rescues, or after battles and want to see if anybody is left alive."

Nigel did want to try this dead spell though. It seemed pretty awesome and he wondered if anyone dead was near by.