The Fijian scrum-half scored one try and had a creative hand in several others as the Hornets produced a shock win over Featherstone Rovers.
That 38-34 win over Fev also brought an eight-game losing streak to an end for the Hornets.
“Everything Ryan tried seemed to come off,” said Hornets head coach Ian Talbot.
“He scored a fantastic try when he chipped over the top, re-gathered, passed to Lewis Sheridan and took the return pass to score under the sticks.
“He was the leader that we signed and the leader who started the season for us.
“He’d been a bit off the boil individually, as we had been as a team, but he was back to his best on Sunday.”
Rochdale had been compelled to play their last six games away from home, with work being done on the pitch at their Spotland home.
Their performance against Fev also saw the Hornets awarded the Kingstone Press Performance of the Week award.
“The main thing was the way that result turned around our recent performances,” Talbot added.
“We’d been looking forward to coming back home and playing on our own meadow, so to put such a spirited and complete performance together over 80 minutes was very pleasing.
“Even last week at Keighley we’d been good for 40 minutes and then terrible.
“To turn that around completely and perform against a really good Featherstone team was great for us.”
The loose forward’s effort helped his team to a convincing 48-6 victory over Swinton Lions.
“The ball went through four pairs of hands before it got to centre Ben Hellewell out wide.
“He produced a brilliant flick pass and that put Kyle Briggs in at the corner.”
Kingstone Press Championship Team of the Week
1 Ryan Fieldhouse (Halifax)
5 Craig Calvert (Whitehaven)
8 Luke Ambler (Halifax)
11 Scott McAvoy (Whitehaven)
13 Steve Snitch (Doncaster)