Damn, spoilers.

Thanks for titling your post with a big fucking spoiler

I think Charlie Whiteknife is playing with mods, and he has the ability to transform into a deathclaw.

I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy:

• yewtu.be
• inv.nadeko.net
• yt.artemislena.eu
• piped.video