You keep walking, and blow your professor off, saying you're late. You hear the ominous whistling of a train, and pump your legs a bit faster, making it to the tracks just in time to beat the train.

You find out later that he had been wanting to talk to you about an internship that had an imminent deadline, which you've now missed.

It's easy breezy from here, and, with amazing prescience, you decide to slip in the back door of Sauder and are at the door, talking to your professor by 3:58.

Congratulations! You do not fail Humanities.