And Mullan, who was named captain on the night, believes Warriors' second Aviva Premiership win of the season was down to those two moments of magic.
He said: "I'm a proud captain tonight. David's solo effort was fantastic and it acted as a turning point.
"Although we didn't run away with the game after that, it gave us the inspiration to dig deep and defend well to protect our lead.
"We owe Paul a big favour as well after his tackle at the end. It won the match for us. He hurt himself but it just highlights the fact that everyone is putting their bodies on the line for this club."
Warriors took the lead three times before being pegged back to 16-16 midway through the second-half. But they finally held on for victory after a try and conversion from Andy Goode.
"It was a great effort from all the players tonight and everyone worked hard for 80 minutes. You can't ask for anything else," added Mullan.
"We knew they wouldn't come here and roll over. We knew they'd be gunning for us. They only had one point coming into the game and they probably saw this as a match they could win. We knew what was coming but we made hard work of it.
"They came here off the back of two high-intensity Heineken Cup matches whereas our two Amlin Challenge Cup matches were a little easier.
"But we all stuck together so this is a massive result for us."