Beat him. Plan and simple; Jack would have beat Cal, there's no 问题 about it! He would do anything for her! And we know that cause he gave his life for her:)! And I know Jack wouldn't hurt anybody; but if it was for Rose; he would. Just watch the deleted scene, "Jack vs Lovejoy" and that should pretty much sum up what he'd do to Cal!
I think 你 mean "seen" not scene. Well, Jack would probably beaten him but then he'd get caught 由 Lovejoy and he'd get arrested, unless he's luckily enough to flee with Rose like he did when Cal threatens him 由 shooting at him with Lovejoy's gun.