[EinNYC]

why would somebody stand by and film it all while it was happening?

Aside from scream, unless they were armed, what could they have done about it, except call authorities? From their body posture, those cats look like they hadn't been fed for days.

[mass55th]

"Aside from scream, unless they were armed, what could they have done about it, except call authorities?"

How about stop filming and get the frick out of there?