He's baaaaaaaaaaaack. He's putting on that grin - get the fuck out of there! Notice also that his speech has gotten more casual instead of his usual elegance. Prowl is really channeling his past punk self. Sad thing is, next page has Prowl looking even more homicidal.
Magnificus isn't dead from Prowl's blast. He just used that as distraction to escape.
Panel 3: Perceptor: Goddamn it, irritating guardian, being framed, finding out I have a clone, this is the most annoying day ever. I'm going to complain about it in the internet.