X-Men: Apocalypse Trailer Breakdown - 40 Things You Need To See

"2. I've Never Felt Power Like This Before"

Given that having black eyes is the universal symbol for possession, this also doesn't look good for Xavier. But then perhaps this is simply a reflection of how Apocalypse's power plays out in Xavier's mind when he's able to detect him. Though it does seem a little odd that Xavier would need the amplifier to detect a mutant as powerful as Apocalypse.