@Sarsak I think they were saying the video was uploaded from the USB to the computer, not to the internet. So it would make sense to take whole computer so he could destroy the disk drive or delete the video from the computer without the other guys interfering. I think.
@Sippers At the end he says "I've already moved the video to the computer and it's uploading on youtube", so taking the whole pc is not gonna work. I guess he could take it somewhere else and then cancel the upload depending on the size of the video and the internet speed, but then again, I've never uploaded a video to youtube, so I don't how it works.