That was a sweet moment! I think Kexin though Yilin won the gold. I'm a huge Nastia Liukin fan, but I do think Yilin's bars routine was better than Nastia's and Kexin's that day!
I saw Yilin helping Wu Liufang jump to the high bar of the UB at the World Cup in Ghent (you know, like coaches normally do)... and failing. Liufang fell down again, realised that this wasn't working and got a block to stand on instead. It was quite amusing.