sorry for the lil rant BUUUT...
couldn't he warned her before saying "look that's the hyper-acceleration button"
like we got this silly moment there (and again MC really only shows off with minors)
then just take her to the hotel maaan, you're acting as her guardian, don't just leave her there, like hasn't he met like a ton of assholes in the last weeks doubting everything, just asking for an POS in that hotel to make the girl have a bad time.
......
ok guess thats one way to do it...
Honestly would have gone with a compound crossbow. Relitively powerful, compact and easy to fire from a sitting position, and some of the newer models can fire rather quickly. Even if the modern repeating crossbows lack in the power department, I'm sure fantasy materials and some enchanting could solve most of those issues.
yeah, and even at this point he could just help putting the bolts/arrows on the crossbow and then she just shoots them to get the magic stones