Interrupt with some sort of verbal you will use every time (thats enough, cut it out) and get between him and the cat, then body block him (walk towards him so he backs up, use body language that indicates you are in a serious mood...be quiet, stand tall, have a tense mouth and jaw, don't smile) and stay between them until Hudson stops indicating that he still wants the cat (so sitting, walking away, looking at your face, offering calming signals, etc.). Then immediately soften your body language, say good boy in a cheerful tone, and walk away. Be ready to do it again as he'll likely try a few more times right away to see if you'll actually keep stopping him. When he stops trying to go back after you move or if he listens to the verbal before you have to go block him, go get a toy and play with him or find some other way to occupy him, he is obviously bored and in a playful mood and you need to show him what to do with those feelings. In the future try and predict when he wants to play and either play with him or, if you cant right at that time, leash or crate him with a bully stick or other chewie so he has to learn to deal with his playfulness and boredom in a cat free way. Always try to stop the play very early before Hudson becomes over aroused and has trouble controllong himself.
With my Tucker and Willie I initially wanted to allow them to play as long as Willie was willing (since he did sometimes play back ) and Tucker was being gentle so I would watch and would only interrupt when Tucker started biting down or nipping (gently but still obviously annoying and unpleasant for Willie). This ended up failing though, Tucker was not able to tell what was and was not allowed, so all play was forbidden and it worked great. There was a point when Willie could literally never touch the ground without Tucker running over to harass him, it was really upsetting to everybody because Willie started hiding and wouldn't come over to us anymore ( since tucker was always with us) but that is not a problem at all anymore, those two get along great. Occassionally tucker will still try to initiate play but he is easily stopped just be me telling him to stop ( and then he'll often run and get a toy so we can play lol).
If possible don't let them be alone together. Make places that the cat can go that Hudson cannot, especially litter box places and sleeping places.