After unsuccessfully trying to leave with a dogsled, Silook has Taft undergo a vision quest in which he sees the truth. When made to choose between two women, Seagal opts for the elderly, clothed grandmother, forgoing the erotically-charged nude Eskimo seductress. The grandmother warns Taft that time is running out for those who pollute the world and charges him to teach them that lesson. To make a point, she has Taft place his hand into water, the instant he does, the water changes to oil.
Upon release, On Deadly Ground met with generally poor critical reviews, largely because of perceived stereotyping of Native Americans and their spiritual beliefs. It earned $38.6M during its theatrical run.
Some film critics characterized the film as rehash of Billy Jack.
I haven't seen On Deadly Ground and I don't intend to. I try to avoid bad movies even if they have Natives in them.
For more on the subject, see The Best Indian Movies.