Most people who get v0red don't last very long in a belly. Be it because it's too cramped, too warm, or the air is too thin and terrible, they'll succumb to fatigue and quit putting up a fight. This is the worst thing you could do, because while the stomach is passively producing enzymes and slathering/squishing it all over its occupants, it doesn't start doing the real work until sometime after prey settles and stops thrashing around, probably to prevent muscular injury from sudden sharp movements.
Jen loves unwilling fighters and Scott's miniaturized stature and physiology gives him more of an advantage over people. But eventually he'll run out of stamina and the slimy stuff he's been soaking in will drain all remaining energy to bump or push around and Jen's fun is mostly over. All that's left to do is jump start the stomach with some comfortably hard rubbing. Just a little bit of that and suddenly her dinner's confines become an overwhelmingly oppressive world of squish and squeeze, passing out in about a minute with no hope to resist.
Poor Scott, he tried :[ Rescue doesn't always arrive on time. Good thing cats have 9 extra lives and nobody's keeping score.