Thanos taunts Tony Stark as he slowly dies, but stops when the Master of the Mystic Arts offers him a deal: the Time Stone for the life of the Avenger.
There are many pivotal, universe-changing decisions made by characters throughout Avengers: Infinity War, but unquestionably one of the most significant is the deal with the devil executed by Doctor Strange in the final 20 minutes.
It’s an exchange that goes through without any tricks, giving the purple alien his fifth of six Infinity Stones, and paves his path towards accomplishing his ultimate goal.
After the heroes fail to remove Thanos’ Infinity Gauntlet, the battle on Titan begins to wrap up when the Mad Titan successfully stabs Iron Man through the chest with his own blade.