(dub) 157 : Hour Of Temptation Page

Fukasaku explains that Sage Mode requires the user to remain perfectly still to gather natural energy—a nearly impossible feat in the middle of a high-stakes battle.

Pain tricks the Konoha Barrier Team by having only the Animal Path enter first through the air. Once inside, the Animal Path uses a Summoning Jutsu to bring the other five Paths and Konan past the barrier. (Dub) 157 : Hour of Temptation

As explosions rock the village, the Leaf shinobi scramble to mount a defense: Fukasaku explains that Sage Mode requires the user

Fukasaku reveals the "fusion" method used by Jiraiya, where a toad sits on the user's shoulder to gather energy while the shinobi fights. However, this fails for Naruto because the Nine-Tailed Fox inside him rejects the presence of the toads, forcing Naruto to find an alternative way to maintain Sage Mode. As explosions rock the village, the Leaf shinobi