what is "click to prime"? is it a rook defense?

yes, once the rook is stunned then someone has to prime the shrine before people can donate. I am not sure why the arrow is where it is - usually it appears directly above the shrine at the proper time

ty for response. i have only been in one rook attack and ended up running around and screaming like a banshee

making tiny bubbles instead of priming.. not my best rook fighting moment. haha

I don't know why the "click to prime" was in the corner

and tut tut Rhubarb Pie, making bubbles while Rooks are flying about

It is pointing right at the "Like this" button - very cute. I shall have to click!

Hehe I didn't even notice that!