Your muscles are uncomfortably tense and your neck strangely stiff as you trudge your way out the now empty lecture hall in which you'd hopelessly attempted to teach a large gaggle of distracted students for two hours straight - key word being hopelessly.
You were good, but you weren't quite a miracle worker. Maybe if your boss finally gives you that paycheck you've been gunning for.
You also don't see the man in front of you, stepping out of his own lecture hall, before it's just a second too late. A glimpse of black hair is practically all you get before the both of you take a rather unelegant stumble - not to the ground, to look on the bright side.
The man grunts, and attempts to take a step back to regain his balance and steady the two of you - an apology is on the very tip of your tongue when he beats you to it.
"I apologize - I should have been paying more attention." His voice is brisk, but not angered nor very irritatred.