As to the topic:
Pic does not look like he was repeatedly punched in the face.
The marks on his neck, taken much later, appear freshly enhanced - the mark on his back does not have the additional pale redness surrounding it like his neck.
Guy is a bicycle blogger of some sort = has a good story to tell.

From his blog, "drunkcyclist.com":

Perhaps the bicycle rider should invest in some self defense training and some protein powder.