1 man dead, 1 injured after mountain lion attack

The two were on remote trail outside of Seattle; the survivor is expected to recover.
1:40 | 05/20/18

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Transcript for 1 man dead, 1 injured after mountain lion attack
Now to Washington state, where two mountain bikers were attacked by a cougar. One did not survive. Here's will Carr. Reporter: Tonight, one dead, another lucky to be alive after authorities believe this mountain lion viciously attacked both. Sounds like the gentleman was attacked by the mountain lion. Reporter: The two were biking on a remote trail outside of Seattle when the mountain lion pounced. One of the victims heard a looks back and they sees that they're being chased by a cougar down the trail. Reporter: The survivor offering a terrifying account of the attack. He said he had his whole entire head in the jaws of the animal and was being shaken around, very, very horribly. Reporter: The panther let go, sparing his life but taking aim at the other biker, who ran into the woods. We have a second patient probably another five miles up north fork road, was being attacked at the time that our patient got away. Reporter: The helicopter raced him to the hospital, and authorities found the other man dead, this mountain lion standing over his body. They quickly shot and killed the animal close to where Steve mickle captured footage of a mountain lion several weeks ago. It was kind of scary. I realized that, wow, there are things out there that are very powerful and this is their space and you just have to respect that. Reporter: Tom, the survivor is expected to recover. Authorities are emphasizing attacks like this are extremely rare. They say if you come across a cougar, the best thing to do is stand your ground. Scream, fight if you have to. The one thing you don't want to do is run. Tom? The attacks, as you said, are rare.

This transcript has been automatically generated and may not be 100% accurate.

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