I once played a Campaign game with some people down at the local gaming store, and after two weeks of fighting back Chaos and Xenos scum, the Grey Knights and Dark Angels player decide that my IG 'Had seen too much' and decided to wrap up the campaign by 'purging those who knew too much'. I thought I was [redacted], until the Store owner slams down 25-hundread points of Salamanders on the table and says: "Uh, [redacted] that [redacted]."
That comment on a deviantART picture led me to wonder; have the Salamanders ever told off the Inquisition or the Grey Knights in the same fashion as Logan Grimnar to save imperial citizens and soldiers they deemed innocent? If not, would they? I know they intimidated Marines Malevolent into relinquishing stolen equipment and beat up one of their captains, but confronting an undersupplied nobody chapter from an unknown founding isn't the same as comeatmebroing the Inquisition or the Grey Knights.
N.B. I know the Inquisition isn't unified.