Have you ever been with someone when they have "lost it"
Or seen EVIL in another person's eyes---it's scary!!!
Jesus just took the disciples (and other boats with them) through the external and internal storm on the Sea....and now they come face to face this DEMON possession.
All were tired and worn, and now a crazy (Matthew says 2 men) came running towards them!!!!
I believe----the disciples could have possibly even heard these men on a calm night screaming across the water.