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In this chapter Kabuto has told us that there are 3 legendary famous places (I guess they all teach senjutsu thats jy they are so famous).
Ryuchido = place where the snakes gather
Myoubokuzan = place where the frogs gather
Shikkotsurin = (probably) the place where the snails gather
My theory is that Tsunade is able to use (snail) senjutsu and thts why she's still alive and thats why Katsuyu doesn't need to hurry up or why he didn't start to heal her automatically because she knows that Tsunade won't die so easily. Tsunade will probably use her Senjutsu to heal herself and the others.