French fan here! The nun tells Archer to calm down because not doing so will make him worse than he already is, because he's hurt. It's not about being in extreme danger.
But very poor choice of words from the writer, who seems not to speak French either, and probably used Google Translate.

Kattegat has really became a zombie-town. I hope when Ragnar and Bjorn come back, we'll see Aslaug's (and Ivar's) head(s) on a spike. Siggurd is the only sensitive person left in town…
I love Torvi's new look a the end, by the way, a true maidenshield!

Good riddance Yidu. I've never liked her, nor understood what she was bringing to the show. She just felt artificial.