to collide, three people who trained in boxing and mixed martial arts. all three are now dead. and key among them is bombing suspect tamerlan tsarnaev, seen working out at allen's gym days before the attack. were you surprised by his demeanor 72 hours before those bombs at the marathon? >> unbelievable. just him entering the ring. i mean, you know, like, jumping over, both legs, feet at his shoulder height, clearing the ring, hopping in, jumping rope, like, yeah, like he was on top of the world. >> reporter: allan trained both tsarnaev and another russian speaker, ibragim todashev. >> there were times they prayed to mecca in the gym, which wasn't abnormal for ibragim to do it, because he did it from day one, but it was abnormal for tamerlan. >> reporter: so, they were getting closer. >> i think so, yes. >> reporter: allan says the two