For sure separate them for a while. He is probably just very hormonal but that doesn't mean you need to keep them together. Maybe let them hang out for a while a day and then put him in pen where she can see him but not be touched by him. Also as they are ducks they need duck things to do so they won't get board and start killing each other.
Give them way more time outside and time to swim. Make sure you keep a close eye on him when they are together.
Give them way more time outside and time to swim. Make sure you keep a close eye on him when they are together.
