The Popper

Friends are out on their bikes, on a run to Sturgis when one, then another race through what seems to be a small fog bank that suddenly appears before them.
But it reaches toward the first biker with an appendage. Time slows to a frame freeze as the second biker through watches his friend lay his bike down.
Three others avoid the fog — or whatever it is — and witness something unbelievable eerie. How many live to tell the tale?