This whole "180 discussion" is interesting. Here's a photo I took of Bob Vogel back at the 2011 or 2012 IDPA Nationals. To get this shot I was behind the 180, but his gun was aimed probably a good 10 or 15 degrees past my left shoulder.
There were no steel targets or anything that could cause frag, and I was getting paid to be there, so I didn't feel particularly unsafe taking this photo, also because Bob is a known quantity. I figure if he's going to shoot me it'll be on purpose. I don't have a single photo of any other shooters from that exact angle, because Bob was the only guy I felt that safe getting close to the line to actually photograph.
Also, side note: when I'm getting paid to take pictures, there's nothing more annoying that some "helpful" RO being all "hey you can't stand there" when I'm behind the 180 and the shooter is cool with it.