You do get a better view of it towards the end of the episode. It did seems to be on the "thick" side. I didn't spot a thumb disk (didn't think it was Emerson). It clearly had thumb studs. ... Definetely not Spyderco (as is the case with a few other shows, ie: True Blood, Dexter). Although I could not positively identify it, my gut told me that it was along the ZT or SOG lines. Beefier, but only +/- 3 in. blade. .... but I could be way-off on this one.
p.s.: welcome me to the forums. I joined just for this particular thread!!