their entire MO is using violence to control. that was kinda the point of seasons 4-5. see Zachariah’s tactics against Dean. see Uriel and Cas’s plans to decimate a town to get at one witch. see Anna being tortured to fall in line, see Cas being tortured to fall in line. obedience comes via extreme violence.
overwhelming violence in order to accomplish a goal is what angels know.
so now look at the alley scene in 5.18 and Cas’s use of overwhelming violence to get what he wants.
So I’m not one to lament Michael!Dean (I prefer canon, tbh), but I got a shiver of a more, idk, metaphorical kind when this vid referenced dialog from Houses of the Holy:
FR. REYNOLDS: That’s right. The archangel Michael, with the flaming sword. The fighter of demons, holy force against evil.
SAM: So they’re not really the Hallmark card version that everybody thinks? They’re fierce, right? Vigilant?
FR. REYNOLDS: Well, I like to think of them as more loving than wrathful; but yes, a lot of Scripture paints angels as God’s warriors. ”An angel of the Lord appeared to them, the glory of the Lord shone down upon them, and they were terrified.”
Not the whole “holy force against evil” schtick so much as AND THEY WERE TERRIFIED.
'Cause Dean right now is skating the edge of a whole lot of terrifying in the name of fighting evil.
—and how long have angels been watching over him, how many times has he survived something he isn’t supposed to survive, woke up from dreams he can’t remember except for the brush of feathers against his cheek