Grunt has me Trapped

[SquirrelLuvsPnut]

I got to the Northern Block of the prison and I turned left and went up the stairs. I heard a growl, so I ran back to hide in the tunnel, but when I got there, a Grunt was waiting for me. He took a few swings at me before I managed to wriggle into the tunnel next to him. I'm hiding in the tunnel, but the dude won't leave. He keeps pacing back and forth (I can hear him). Do I just have to wait longer for him to leave, or do I make a break for it? (Which way should I run and where should I hide) This is my first time playing Amnesia, so please be gentle.