Sam had a few seconds to be surprised. It had worked. It had actually worked!

Then the psychic wave of the Leviathans' deaths hit. Sam was already sensitive, partly because of the earlier voices and partly because of his own dormant powers. So when the wave hit, it hit him HARD. He screamed, comms thankfully off, then lost consciousness from the shock.

He was going to wake up with one HELL of a headache. And a bloody nose.

It was going to be a bit before he knew what else the wave had shaken loose in his head.