CNN Starting Point April 22, 2013 11:39:00
Like nervous or anything. >> reporter: dzhokhar worked out for awhile and didn't shy away when zack brought up the bombing. >> i was like, yeah, these things happen in other countries, maybe iraq and afghanistan and stuff like that. and he's like yeah, tragedies happen like this all the time, and it's sad. >> reporter: just days before helicopters and s.w.a.t. teams descended on umass-dartmouth dzhokhar was seen all over campus. students have to swipe their i.d. to get entrance to the building and records show tsarnaev did just that right here on wednesday. friends saw dzhokhar walking around ...