They were vanquished 38-6 at home to struggling Rovers on Thursday with a worrying display that left alarm bells ringing.
“I’m frustrated, disappointed and a bit angry,” admitted Stone.
“Before I start, I’ll just give full credit to the opposition: they were good. But when playing at home in front of your family and friends, your fans and members, you’ve got to turn up and put in a better performance than that.
“We needed to mix things up a bit in attack and get some variety.”
Australian full-back Jake Mamo was missing after straining a hamstring in training on Monday. He will be doubtful for Friday’s trip to Wigan Warriors.