Mouse Finbar: Did I die and turn into a small muscular boy scout?
Dr Smolder Bravestone: Who is Jumanji?
Mouse Finbar: Is that Barbara's boy?
[Dr. Bravestone driving towards the flock of ostriches]
"Mouse" Finbar: What are you doing?
"Shelly" Oberon: Birds, birds, birds, birds! Birds!
[Dr. Bravestone turns around, driving towards the cliff.]
Oberon: What the hell, man!
Bravestone: They're flightless birds.
Ruby Roundhouse: This is a flightless dune buggy!
Milo Walker: What in the Sam Hill?
Young Marsha: I think he went back in. We gotta go get him.
Young Fridge: Are you crazy?!
Professor Shelly Oberon: No, no, no! I'm the old fat dude! This can't be happening.
Answer: In the building with the Jumanji berry tree, there were flames on the wall. By following the flames on the wall, Ruby was able to get to the tree, rather than try to cross the waters somehow.
Bishop73