“An Ettin with magic power? It’s… absurd! And unfair!”
“Wait… did they just hit their other head with magic missiles?”
” …We might get out of this pickle after all!”
It so happens that some ettins, who are distant cousins to the orcs, live among them, following a more or less mutually beneficial agreement (Ettin, Monster Manual, p132). Even if they are not in general extremely loyal towards their allies, the two-headed creatures sometimes pay a strange attention to the rituals of the ones they are supposed to protect.