They're like best buds. There are tons of videos of them hanging out and doing stuff. It must be like a charity exhibition.
Brian has no technique when it comes to striking. Eddie has some skills from the boxing training he received. I watched a video of them hitting that punching machine and Eddie hit it harder than Brian did but Brian's technique was terrible and he still hit it very hard for how terrible his technique was.
If Brian gets ahold of Eddie though, he's probably done lol
*EDIT* - Just went to the Youtubes and Brian is saying it's Eddie Hall vs Mitch Hooper and Brian Shaw vs Martyn Ford with the winners facing each other.