here is the link to the bbc audio if you skip to the end with boyds interview you can hear nacho interupt with "Oh Ah Samaras"!
http://news.bbc.co.uk/sport1/hi/scotland/8066335.stm
i would stay there is no guarantee he would start and unless he is getting a much higher salary it would dumb to leave...he is getting the same money for a shittier team in a shittier league.
My guess would be because he score right before he came off. I think he might of pulled something a lil tight if they havent discussed it on the website i doubt he is severely injured.