the Jester
Legend
In my judgment, that's not committing murder, first of all.
Second of all, what is his oath and alignment? That makes all the difference.
Third, I disagree with the (prevailing) sentiment that you should get the player's permission to impose divine punishment on a paladin who violates his oath. That's the whole point of the oath- he has to live up to it or fall. But that's absolutely a matter of playstyle preference. To me, being a servant of a power (and that's how paladins work in my campaign) comes with expectations from that power. The same thing applies to clerics and warlocks.
I recently had a pc paladin of redemption go murder hobo for a combat, attacking and killing creatures that were just trying to defend their home, even after the other pcs wouldn't help him and tried to talk him out of it. Afterward, he couldn't get the blood off his hands or blade. He needed an atonement spell to fix things, and had to demonstrate remorse and sincerity to get it. (I converted atonement to 5e long ago, so it was an existing fix for exactly this kind of thing.)
Second of all, what is his oath and alignment? That makes all the difference.
Third, I disagree with the (prevailing) sentiment that you should get the player's permission to impose divine punishment on a paladin who violates his oath. That's the whole point of the oath- he has to live up to it or fall. But that's absolutely a matter of playstyle preference. To me, being a servant of a power (and that's how paladins work in my campaign) comes with expectations from that power. The same thing applies to clerics and warlocks.
I recently had a pc paladin of redemption go murder hobo for a combat, attacking and killing creatures that were just trying to defend their home, even after the other pcs wouldn't help him and tried to talk him out of it. Afterward, he couldn't get the blood off his hands or blade. He needed an atonement spell to fix things, and had to demonstrate remorse and sincerity to get it. (I converted atonement to 5e long ago, so it was an existing fix for exactly this kind of thing.)