GR translation: jolts over a set of surprise points

[Mike Jing]

V619.16-32   Well, it’s an older Jug, one with a greenhouse canopy. The
barred field of sight gives Pirate twinges of memory in his neck muscles.
The plane seems permanently out of trim to him, though he still fiddles now
and then with different tabs. Right now he’s trying the War Emergency Power
to see how it works, even though there seems to be no War, no Emergency,
keeping an eye on the panel, where RPMs, manifold pressure, and
cylinder-head temperature are all nudging their red lines. He eases it down
and flies on, and presently is trying a slow roll over Celle, then a loop
over Brunswick, then, what the hell, an Immelmann over Magdeburg. On his
back, molars aching in a grin, he starts his roll a hair too slow, just
this side of one-thirty, and nearly stalls it, jolts over a set of surprise
points—finish it as an ordinary loop or go for the Immelmann?—already
reaching for ailerons, forget the damn rudder, a spin isn’t worth worrying
about . . . but at the last second does give the pedal just a touch anyway,
a minor compromise (I’m nearly forty, good God, is it happening to me too?)
and rolls himself upright again. It had to
be the Immelmann.

What are "surprise points"?
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