Man, shite got weird real fast in that video. One second, they were having a normal conversation even laughing about the hot, steaming pot of water, the next second, she, out of nowhere she says to him "I rebuke you in the name of Jesus". Then repeats it and this cop flips the F out.
She does duck down to the floor and out of sight with the pot of water still in her hands but that cop could have retreated back a step or two and been in no harm. With the obscured view of the counter in place, it is possible she was preparing to throw the pot of water at him, but, as I previously stated, the cop could have simple taken a few steps back and been in no danger.
It's like he was so enraged when she brought Jesus name into the conversation that he just flipped out.
The other cop, Deputy #1 whose camera I was watching, you could tell he was like "WTF did you just do?" While the shooter was making all sorts of excuses about not taking a pot of boiling water to the head, justifying his actions for the body camera he knew was rolling.