Robin was just about to agree, when Marian did it for him. Not that he minded, although he rose an eyebrow at her good-naturedly when she handed Booth one of his arrows, and gave Robin her borrowed bow. Nodding to Booth, he gestured toward the lane he had just been using. "I don't mind at all. Do you know how to shoot?" Noticing the gun at Booth's belt, he chuckled and clarified, "An arrow, that is."
He had been introduced to firearms during the few days he'd spent at Bobby's boot camp, and had found them... interesting. Part of him loved them; there was a definite thrill that came from holding a device in one's hand in which a small explosion took place. And the possibility of mastering another weapon appealed greatly to him. But, all the same, there was another part of him that shied away from them. Perhaps, if he were to become more familiar with them, he would not be so wary-- after all, the basic intent was the same with the bow: using a projectile to take down a target.
With the bow, Robin knew how to do that in a non-lethal fashion. To be sure, he had killed more men than he had only injured, mostly in the Holy Land. As far as a gun went, he could just as easily kill someone by accident as he could by failing to do so in a situation that required it. And the shotguns... he knew they might be necessary, but he was not keen on them.
However, none of that really occurred to him consciously, merely reflections flitting through the back of his mind, so it did not register in his expression, nor in his mood. Instead, he offered, "I'd be glad to show you, if not."