JACKSONVILLE, Fla. -- When two bombs exploded near the finish line of the Boston Marathon last Monday, 26-year-old Tamerlan Tsarnaev and his 19-year-old brother Dzhokhar calmly walked away, as three people died and nearly 200 were rushed to the hospital.
It is that act that led police to suspect the two brothers of being responsible.
On Thursday, their pictures and surveillance video from the scene were released to the world, and within hours a chase began.
Tamerlan died during a shoot out with police, but Dzhorhak continued to run until his attempt to elude them ended inside a boat Friday evening.
In the days before that, however, the teen has returned to his normal life, something many of his friends, and the rest of the world, have trouble making sense of. It does makes sense to Licensed Mental Health Counselor Cindy Richetti.
Investigators believe the brothers were motivated by religion, and Richetti says that explains a lot.
"They somehow, in a misguided way believe that they're doing something noble or justified."
Richetti says Dzhokhar Tsarnaev was likely easily influenced. She researched the brothers cultural upbringing and says it likely encouraged a macho mentality, and held with clear hierarchy among men.
"I think it's very possible that he's a victim of his brother's brainwashing."
But Richetti says that's no defense.
Video shows the teen was ready and willing, even running over his brother as the police chase began. Richetti says that may be the only thing this suspected terrorist regrets.
"They were planning to do this, they were OK with it, they were ready to do it, that's what they wanted to do."