you are a security guard at black mesa. One second you were just in the security room watching cameras the next you were running for your life and shooting anything that moves (hasn't worked well you've shot a few scientists by accident).

on reaction you shoot at a bright orange moving entity that ran to the left of you and the bullet bounces off. It was a HEV suit. Yet another scientist you shot.

he looks at you almost as if expecting an answer, he doesn't talk however.