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The twist is that it’s a shapeshifting killer robot from the movie Terminator 2, specifically a T-1000 sent back in time to kill the child in question. The biker, on the other hand is an older (non-shapeshifting) killer robot model also sent back in time (to protect the kid from the newer model).
You’re welcome :) Terminator 2 is an incredible action movie, one of the best I’ve ever seen. This scene alone right at the beginning will forever live rent-free in my mind. So yeah, if you like action movies, both it and Terminator 1 are great to watch.