He could feel his heart beating 'cause of what he was about to do now. If he gets caught by one of the teachers inside while peeping, things would definitely happen.
Or let's say one of the teachers inside the office suddenly comes out and catches him, things would definitely happen as well.
If the plan was to enter her office, find an excuse for entering her office which they'd believe, then check out her status, he doesn't need to be afraid of getting caught.
But he planned on doing all these without getting caught, that's why he could feel his heart beating...
Well, he has to do this no matter what, he shouldn't waste any more time. So he peeped into her office, and according to what he was seeing, Miss Amaya was inside.
Seeing this gladdened his heart a lot...what remained was to check out her status interface.
So he called out on the system from the mind, 'System'.
[Yes, host]