He was almost wetting himself, trying to justify himself to her and the other two.

Because she is so intimidating to him

I am afraid of her and i am not even in there

He is pretending.

I can't imagine having to live in that house. The atmosphere must be toxic. To be constantly worried that you'll make her kick off!

He's a spineless Baa less wee Scunner o a weed

Don't be silly Op ,Mark is a self proclaimed Gobshite ,and isn't bothered by anyone in there ,he was just playing the game and making sure he wasn't nommed by them next week