The Exact Moment Each Person Became Assimilated In The Thing

I've grouped these three men together as they are all killed by The Thing but are not shown to be assimilated fully. Windows has his head munched on like he's a bug in a Venus Fly Trap, and is burned alive shortly after.

Garry is force-fed Blair-Thing's hand in a rather disgusting but visually impressive scene, thus officially ending his command of Outpost 31.

Nauls, who in an ironic twist considering that he was ready to sell MacReady down the river, is actually his last ally in the closing moments of the film, but after going to check on Garry is taken down by The Thing off-screen.

It's actually pretty likely that Blair-Thing assimilates these two men and any other remnants of the Dog-Thing that might have survived as its final form is clearly made up of several different, and disgusting elements.