They do not show how Negan was holding Lucille when the bullet hit the bat.
I think it would either strike him in the face, get knocked out of his hands, or both.
mmm
Settle down Eugene. We don’t need anyone coming ‘round here nerdin’ up the zombie apocalypse.
Consider Mr. Newton’s laws: For every action, there is an equal and opposite reaction.
The kick hitting the bat is equal to the hit of the kick of the pistol.
Ah well; I could have checked before I posted, looks like I should have. 
Works better as PENT. Still has the pronouncablity factor.
I think he’s one of the Wolves. I think it’s the Wolves who attacked Hilltop rather than Negan trying to send them a message.
The Saviors referenced it when they showed up at Hilltop the next day. Said to Gregory by Simon:
“So, last night, that was us working our asses off to provide you an example.”
“She got in the way.” Ha ha!