He doesn't want it on his right foot but has complete confidence in his physicality being able to get rid of even Upamecano. Most players would stick their leg out like that to win a penalty but he wants to score there and then.The real brilliance of the goal is the calmness he shows to not take it with his right foot, but turn back on to his left, despite it being the quickest and easiest option, even with a player grounded and in his eye line.