Chris Malone's boot kept Quins in touch, the fly-half kicking 19 points.
The left wing gathered his own chip-ahead and stepped past O'Gara before offloading to the supporting Phil Godman, but the fly-half was thundered into touch by a retreating Brian O'Driscoll just a few metres short of the Irish line.
They needed a quick score in the second half and got one thanks to some sloppy work from Nick Williams, who failed to deal with a Humphreys kick to the left corner which allowed the Ulster fly-half to run up and touch the ball down.
Latching onto a cleverly disguised inside pass from fly-half Butch James, he outpaced the cover to touch down as he was caught on the line.
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Stephen Jones put in a try-saving tackle on his rival fly-half but the ball rebounded off the Scarlets man into touch and the Ospreys had a five-metre attacking line-out.
Besides, kids ask all kinds of weird things, like whether they can fly or whether, if they stand on a chair, they can touch the moon.
The fly-half took a quick throw to himself from Halfpenny's long touch-finder and spotted Fernandez Lobbe lurking on the left.
One of the great things about fly fishing is that its practitioners, like me, are able to stay in touch with it even when we are homebound, marooned in trout-less urban landscapes.
Parks punted a penalty to touch and lock Davies muscled his way over off the next phase, the fly-half adding the extras.
That looked to be it for the opening period with the clock touching 40 minutes, but Blues fly-half Sam Norton-Knight opted to kick upfield rather than send the ball into touch to end the first half.
The fly-half's fourth penalty was his best, the kick sneaking over from wide on the touch-line to take the Scots two scores clear.
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