[ Being on constant high alert for every little thing might not be great for her heart, but it means she knows a lot about the 3458962 ways you could possibly die from any given situation. So when Bakugou coughs and says that he'd been stung, she's going to have to beg to differ that he's not going to fucking die from something like this. ]

Try not to move!! Are you having trouble breathing? [ or whatever passes for the "breathing" they're doing now ] Can you feel your hands? Jellyfish stings- they might not sound so serious, but your lungs may become paralyzed and then you'll stop breathing and then you'll die!

[ And if that's the case, there's little she can do to help ]