Late. Late late late late late.
Toby just wasn't used to not moving as fast as usual, so it made his timing completely off and, as a result, his time management was way out of whack. The Hufflepuff skidded to a stop outside the Potions Lab and headed right in, slightly out of breath but figuring that the door being open wasn't such a bad sign.
Except Culloden was already talking in the professor-y voice and telling people what to do.
And... dismissing them.
.................. Nothing for it then. Despite the fact that he'd only just got there, Toby guessed he should just... take a copy of each book and... go. Which... was exactly what he did. Just a flying visit, apparently. See ya later, Culloden.