This comic implies that Marena has Bruise-Relief Method, but doesn't have Halting the Scarlet Flow.
But then, it's also way back from the very start of the first arc, so it's hardly impossible for her to have simply learned HtSF between then and now.
This comic wasn't a very good one, in my opinion. It didn't advance the story in any meaningful way, it didn't give us new insight into an important character's personality, it didn't have much action in it... All it did was tell a joke that was, well, kinda lame.
That it came right after a...