Oh, I didn't make the connection to what Chuck saw—that could work. (Of course, BUT WHAT WAS IT? remains the pertinent question.)

Cas has definitely been skirting that line for a while, as you say; I'm just very interested in specifics—I want to know specifically what made Zachariah or whoever decide that they actually needed to intervene in such a drastic way. Or, if they were just disturbed by a general pattern, why act to correct it NOW?