Just like it says really, how did the barefoot guy get on? Were there many other barefooters in the mix? It looked awfully crowded to be comfortable in bare feet, I should think the biggest risk was someone else standing on your feet!
Go barefoot, it'll strengthen your feet not damage them! Start off VERY easy though - a three to five minute out-and-back jog on flat tarmac is probably best.
Take it very steady and you'll be surprised how little it hurts, in fact it feels GOOD!.
Over the summer I was running barefoot on the moors, up to about seven miles and only once hurt my foot so don't worry about all this 'broken glass/dog mess/ sharp stones rubbish, it's all stuff you can avoid if you watch where you're going. I sometimes took a pair of flip flops along if I knew I was going to hit a nasty stony bit but by and large all those different natural surfaces were a joy to feel under your feet.
Bring on a bit of dry weather, says I, and I'll be back up there again, barefoot. At the moment I'm running in vivobarefoot shoes and I love them, too.