Awww...pretty boy is right!

Could you use a "Feliway Collar" on Trouble to help him calm down? All that is is a stretchy collar that will slip off him if caught, but can be drawn up snug - and instead of spraying Feliway in the air, you put a wee shot in his collar(shake bottle first). You might ask your vet about this.

I guess if you are able to keep a cat-aggressive husky away from your other cats, you'd be able to keep him/her away from Floyd.

You'll make the right decision.