1)
What did he ask him if he saw?
1.
Rashi: How this river overpowers. Radak ? contemplate this. So the good of Yisrael will increase!
2.
Malbim: Did you understand what I showed to you?
2)
What is the meaning of "va'Yolicheni va'Yshiveni Sefas ha'Nachal"?
1.
Radak: He took me out of the water, and stationed me on the bank of the river into which he entered me [beforehand].
2.
Malbim: He returned him a second time to walk on the bank.