Head coach Tony Lajpold said the error rate was talked about at halftime when the home side trailed 24-10.
Despite further unforced errors, the Stallions shored up their defence, holding opposition players up over the line on several occasions, with the only Bulls try coming from Nathan Saumalu.
Lajpold was heartened by the defensive effort: "In the first half they scored three times off our errors, but in the second half we held them out for three sets [of six] and when they scored they earned it - but there weren't many [tries] they did [earn]."
At 28-10, the Stallions finished the stronger with Otumoetai Eels centre Josh Tupou going over after an offload by Queensland Under-18 rep Keanu Dawson (Ngaruawahia Panthers) and a flick-on from Karena. Tupou was in the action again moments later, making a strong break down the right to feed Noda on the inside, who ran in to finish the try scoring, Karena converting to make it 28-20.
"The last try shows they can play footie when they want to, but sometimes it's about being smart," said the coach.
"But last week, compared to this week, they were totally different."