Keep telling yourself whatever you want to justify being violent to others. It's sure not self defense...

Read it again, doesn't say she was in his way.

Dude, they are just as bad as each other. He could have still left but chose not to. She could have not then been equally as aggressive when face to face.

Just because you feel that it's justified having a fight because of thrown tissues, doesn't mean it is. Tissues are scary huh.

Can gender swap or have it as whatever genders you want & I'll still think they're both at fault.

Pretty hefty defence against a box of thrown tissues.

If you can't see that this was equally bad on both sides...

Looks like you both chose violence here. Red flags on both sides.

First step would be to communicate & apologise to each other.