During Ryner's first year in Johto, he had met - and been joined by - a Paras named Aran, a friendly little bug who never had as much interest in battle as many of the others on the team. Still, Rose has her ways of dragging most everyone into sparring at least on occasion, and so Ryner has seen many times how Aran fights, and how his mushrooms tend to do most of the work for him. Sometimes, it's like the mushrooms have a mind of their own, and the ability to sense danger before Aran does. So, supposing that Aran is reasonably typical of the species, but given that Aran and his mushrooms are significantly more experienced than your average wild Paras...

This is why Ryner pauses his sneaking a few feet away from the battle for a moment, a quick breath while he observes the proceedings and keeps an eye on the Paras' attacks, especially those of its mushrooms. They won't have infinite spores, and after a spore-using attack is launched, it will take a moment for them to recharge, so to speak. So, it's just a matter of watching the flow of the battle, making sure to account for Sion's Sneasel's claws, and wait for an opportunity just after a spore attack.

Steady...

Steady...

There!

With swiftness you don't usually see out of Ryner in his everyday life, he leaps toward the Paras, reaching out to grab a mushroom and then, hopefully, get out of the way as soon as he can.

And if he's wrong and this goes badly, well, in his experience spore attacks suck less on the skin than when they're breathed in, so there's that much he's already accounted for.