"We've put that to bed and we've got to focus on other things. That's not just outside, it's also inside. We talk it about it a lot here too. Sometimes we talk about it that much it becomes more of an issue than it should be so to finally put that to bed is good."
The Kings were willing opposition despite a porous first-half defence which saw Melani Nanai score two tries from attacking lineouts in four minutes. They missed 19 tackles in that first 40 minutes which allowed the Blues to go to the break 19-10 ahead but, despite playing in front of a pitifully small crowd at the Nelson Mandela Bay Stadium, there was no waving of the white flag.
They pushed to the end - and came within striking distance at 22-18 with 20 minutes remaining - only for the Blues to ease away again.
Umaga said: "It was a lot tighter than we would've liked but as we've shown in previous games our ability to hang in there and comeback is probably the most consistent part of our game. The concern for us is we can't rely on that."
The Blues' next assignment is the Lions at Johannesburg's Ellis Park, a much taller order, but Umaga's men will have taken plenty of confidence from their rare victory away from Auckland.
"We're thinking if we play anywhere like we did tonight against the Lions then we won't get the result we're looking for," Umaga said.