The coordinated action--and spectacularly compressed time frame--necessitated in a competitive pit stop leaves little room for innocent bystanders, as this unfortunate (but apparently uninjured) woman found out the hard way.
According the YouTube video poster, the team yelled clearly, "GET OUT OF THE WAY!" before rushing onto the scene, but the woman apparently didn't heed the warning and met with the shoulder of a crew member before the driver and another crew member rushed in behind.
The bottom line: keep your wits about you when you're in pit lane, or you just might get them knocked out.