You were running from Baldi, until Dr. Reflex came up to you, but you ran right past him, because Baldi was chasing you and you would have died, you heard Dr. Reflex get mad as he says.

"This ain't over yet..."

He walks to his office grabbing, his large reflex hammer, you lose sight of Baldi as he gets confused on where you went, you had Dr, reflex looking around for you, you head into a room when he passed by he didn't notice you, as he kept walking.