[ It's fine, just be aware that I'm still on hiatus for a bit longer so that's why I'm a little slow. ]

Weiss would look very irritated when she came in. Most people would say she probably looked about average since she can be a very irritable person, but in this case the cause was certainly this person.

"It's also rude to barge into my office instead of speaking the front desk like guests are intended to. You have about ten seconds to give me a good reason not to call security."

Or just fight her herself, but Weiss knew she would make a mess given her fighting style involving ice, and Armin would probably get frustrated.