There was no way Booth would have just simply let Marian into helping with the kids if they hadn't met in person. He was a people reader. Not in the magical sense, but he could tell almost anyone's intentions just by watching them. Picking up on body language and social cues. Over the computer his abilities were halved and he couldn't tell what her intentions really were. This was a much better deal for him.
When Robin suddenly handed him a bow all trains of thought just stopped and he had a moment of instant fanboyisms. He was holding Robin Hood's bow. The legendary weapon. All he could do was gawk as he took it into his hands and a grin tugged at the corners of his lips and broadened into a bright amused smirk. "You have no idea." He looked it over, then glanced at Robin, and then at the targets. " You don't think I could.." He motioned with his eyes. He wasn't an archer, and he didn't want to be to forward or rude or anything. So he just tried to be subtle, but his mind was reeling. Robin Hood's bow and arrows. Like a broken record on repeat.