Remi'll be fine. The teacup however, will not. Sakuya's one trigger pull away from becoming a pirate maid, and Marisa's about to have her day brightened by a spark of joy.
To be honest, that thing looks like something that won't be able to fire properly a second time. In fact, Remi should tell when her maid took her work so seriously...
don’t those sorts of guns have high recoil while unmounted?
Well yes and no. Single shot wise, a 50. doesn't *quite* knock you backwards because the gun absorbs most of the recoil.
And it does that as a consequence of weighing about 14kg (31lbs)
Trying to line up 14kg worth of gunmetal at shoulder level is... difficult to say the least. So it's pretty much impossible to aim without resting it on something.