1)
What is the meaning of "Lo Ki Asor Ne'esarcha"?
1.
Rashi: We will not kill you; we will only tie you up.
2)
Why does it say "va'Ya'aluhu Min ha'Sela"?
1.
Radak: Bnei Yehudah's place was higher than the rock - "v'Yerdu? El Se'if Sela" (verse 11).
2.
According to Rashi (verse 8), he was in a crevice in the rock. We can say that they lifted him out of it. (PF)