That video snapshot has likely been manipulated. This one fuzzy shot makes it seem like Kyle is holding his rifle as if left-hand dominant (sling is wrong for that, too). He is right-hand dominant in all other footage. MUCH clearer footage

https://www.lifezette.com/2021/11/new-fbi-infrared-video-blows-kyle-rittenhouse-prosecutors-case-into-a-million-pieces/

That video snapshot has likely been manipulated. This one fuzzy shot makes it seem like Kyle is holding his rifle as if left-hand dominant (sling is wrong for that, too). He is right-hand dominant in all other footage. MUCH clearer footage