Adam Thompstone scorched over for the fourth try with the final play to cue wild scenes at Welford Road but fly-half Flood was far from ecstatic at the end of an error-ridden encounter.
"If we qualify from our pool, we will look back and think we got five points which were important. But it's such an odd environment when you take five points and play as poorly as that. We didn't deserve it," Flood told Sky Sports.
"We made too many errors, again. There's no rhythm at the moment, no continuity. We are making too many errors and every time we get any momentum we turn the ball over. It has been frustrating to say the least.
"They came here to shut up shop and make life difficult for us but we made life harder for ourselves.
"The rain wasn't ideal but you can't blame the conditions. There were set piece errors, handling errors, continuity mistakes, all sorts of things. It's really disappointing. All of us can be better."
Next up for the 2001 and 2002 Heineken Cup kings is a December double header with in-form French outfit Montpellier and Flood says his side will have to make substantial improvements to ensure they remain in the mix heading into Rounds 5 and 6 after the New Year.
"We need to raise our game massively in terms of the last five or six games we've played. We've just done enough and just been getting by, which is not acceptable for us.
"I'm a huge part of it, I'm captain of the side and I have to manage that. We will deal with it. There's a lot of disappointed guys in that changing room."