Alt-text: "Right, Kat, 'awkward'. Not 'hot'."
Easily distracted much?
Homosexuality is still not a thing you'd do publically among humans or byzarians here ... but she seems to have had some suspicions about him before, otherwise she would be so quick to come to that conclusion, wouldn't she?
Updated on 2018-03-02: I have to retcon a bit what I wrote above (in the comment, not the comic itself) - by that time Katharina knows Halen well enough that she is well aware of his sexuality - so the thing she hopes Halen didn't do is less "do it with a man" and more "do it with their boss who is much older and might be a traitor" ...