The shock
"Dad please you need to take things easy, you can't be destroying things like this. You can't even let people know you are this affected by what's happening. For Pete sake, control yourself." Jude said as he tried to hold him down and stop him from destroying things. He's also angry himself and at the same time happy, at least he's going to get to see everyday.
And the fact that she's going to be his boss is something he's really curious about. He honestly never saw this coming or thought a day like this will ever come. Mike couldn't bring himself to calm down, he cleared everything on his table with anger. Crashing his laptop and every other thing. Mike made sure to close the windows to prevent anyone from seeing them.