"I wouldn't call it "little". We are talking about a Bijuu sized creature's ability after all.
It is far from instant. Manda had plenty of time to shed his skin and go underground, Katsuyu had the time to get far behind Gamabunta and reform herself. "
Compare to jiraiya's fire technique, it's nothing. Katsuyu had time to get behind Gamabunta only cuz Jiraiya told tsunade to move out : | and didn't use technique, until they were in the safe zone.
"Katsuyu is an enormous creature who was never summoned in her full size. Look what Orochimaru says here [X]. This scan further proves my point because it shows both Tsunade and Sakura are required to summon 1/10 of the slug. [X]"
Lol what ? : D Slug's full size was shown, when Tsunade summoned him in the konoha, to protect and heal people. Orochimaru said it, cuz he said : D to say shortly, look at the size at your scan, and now look at this :
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lazy to search manga page..
AND, Tsuna/Sakura weren't able to summon them in THAT VERY MOMENT, cuz they didn't have enough chakra AT THIS VERY MOMENT.
" You are talking about a Tsunade who hadn't fought in nearly 30 years and hadn't slept for a week. She was still able to beat the living crap out of him once she managed to overcome her fear of blood, so I don't see what's your point there."
The point was next : Even when Tsunade hit Orochimaru 10-20 times, with his super strenght, killed him only 1 time. Now you got it ? Jiraiya's reflexes are way beyond these two. they won't be able to even hit him. And even if they do it, Jiraiya simply won't take any serious damage.