To be fair: How easy Vader was to work with had much to do not only with his mood but also the competence of the people he was working with. People who were incompetent or careless with the lives of the stormtroopers? Were the ones most likely to find out how fearsome he could be.

Thinking of the bait sinking, Vader focused on it and used the Force to keep it near the surface where it would be useful. He almost - almost - dropped it when the fish hit the boat, but managed to hold it. Even still he watched Fett closely, but also their prey - reading it for signs of attack or life.

"They do seem to be." Time to try to moat them off for defense he thinks.

With Boba's prey dead, Vader turned toward the water, and followed a few tails until he picked one of the larger fish, lifted the spear gun, aimed, and fired. It didn't quite hit the shot Fett had suggested and Vader reeled it in hard, using his knee to pin it down and shoved the spear in deeper to completely sever the spine. Good thing about metal legs - he hadn't even considered the jaws of the fish. Hadn't needed to.

However there were now some rips in the fabric and no hiding the dull dark grey and shiny lighter grey metals that made up his legs.