Directed, Redirected aggresion

Isaac is back to attaching Levi when he's upset about something. I understand that it's redirected aggresion, but I'm wondering why it's directed at Levi. Last night he tried to jump on my back & missed. When he fell it scared him, then he ran past Jordan & Maggie to attack Levi?

I so wish I had some advice! I remember your past thread and feel for your situation! Only thing I can think of is pet psychic!