- last post: 01.01.0001 12:00 AM PDT
I see it this way. Since the Grunt is not the same kind of life-form as humans (i.e. the whole methane breathing), it's sense of smell may differ drastically from ours.
We breathe oxygen (mostly), to us it seems odorless. Perhaps this is reversed to the Grunts, they breathe methane, so it seems odorless, which means they can smell through that methane to smell other things, like carbon monoxide, which would be produced by the Pelican's engines.