Question: why is tegan mad at michaels?
Answer: Tegan is aggravated that Michaela is a part of Annalise's legal clinic, and she's upset that Laurel is also one of Annalise's students. At first, Annalise tries to assuage Tegan's fears, reminding her that she "saved [Laurel's] ass" and that neither of them had any reason to give her trouble.