Andrei trusts Professor Lambert with his life, both on and off the battlefield. Had all but sworn any loyalty he still had left to give to the older man, even with his monarch's presence still looming over his time here.
After that kind of admission, though, he does not trust Professor Lambert with one of his own bows. He'd seen the professor's strength in action plenty of times, a nearly inhuman power on par with, or perhaps even surpassing, that of a Major Blood. He knows that Lambert holds the equivalent of such in Fódlan — a Crest, as they call it — and with each battle where they stand side by side, he is reminded of how much his own power pales in comparison.
(This, too, reminded him of Fath—)
Flinching back from those thoughts, Andrei reconsiders his options, before remembering his most recent acquisition.
"I received a weapon from the monastery, after returning from the previous mission," he says, "Its aiming and shooting mechanisms are similar to that of a crossbow's, but it releases… pieces of metal shrapnel instead."
Thumb and forefinger parting only a small amount, Andrei mimes the size of one of the pieces that he'd seen from the weapon itself.
"It seems a small size, but I know its destructive powers well. We were— we were attacked by an enemy wielding a similar weapon." Even now, he shudders at the memory of the sheer power behind the attacks that metallic foe had been able to direct towards himself and his allies. But the monastery had given him this power in turn, and so he had worked to overcome his own distaste and master it.
(There is no place for fear, when it prevented strength.)
"I have practiced with it a few times, so if you would—" Right. He is expected to play the role of professor. Andrei clears his throat.
"I believe we can begin with that. The weapon itself is made entirely of metal, and much more difficult to break."