On the linesman leaving the game, here is a quote from Rasor's blog.
OK. Here is the unofficial word about the referee. The head referee and the linesman were alleged to be arguing. The linesman marched off the field, taking his flag. The game was delayed while the impromptu lineman searched for a backup flag. I can't vouch for this being 100 percent accurate, but it's some version of the truth. Only in soccer.
Halftime stats: Akron leads Cal in shots, nine to six, and shots on goal, five to two. Both teams have had four corner kicks. Cal has committed 11 fouls, compared to Akron's two.
Update on the referee drama: Caleb Porter was arguing nonstop with the guy who eventually split. Before leaving, the linesman told the head referee that, "Either he [Porter] is leaving, or I'm leaving." As a result, the linesman has left Lee Jackson Field, and he took his flag with him.