Premise:
"No, can you?"
Hypothesis: I can do it.

no

Premise:
"Now the salamander moved toward them, directed apparently by slight motions from Sather Karf."
Hypothesis: The salamander was moving away from them.

no

Premise:
"But that's no call to saddle it all on Drew."
Hypothesis: That doesn't make it ok to put it all on Drew.
yes