PORTLAND -- Roshawn Lenkau loves those video games where he can pretend to be a police officer. He has been fascinated with law enforcement since he was a young kid. He even enrolled in an explorer program with the L.A. County Sheriff's Office before moving to Portland.

All that training helped him possibly save a life Monday.

What I learned from other sergeants and officers and stuff, is that they're always telling me, 'Nothing can turn into something at any time, said Lenkau.

Any time came Monday afternoon. The 15 year old was near Southwest 5th Avenue and Stark Street when he noticed a homeless man brutally attacking another homeless man.

After the first five seconds, I'm thinking, 'I can't hope and pray for someone to break up the fight and save this guy.' I'm going to step in and do something, he recalled.

Roshawn ran over and broke up the fight, but he did not stop there. Using the tools he had learned in the Explorer Program, he attempted a citizen's arrest on the attacker.

He starts clenching his fists real angry like he's going to punch me in the face, said Lenkau. That's when I pulled out my flashlight and shined it right in his eyes.

The blinding light was disorienting. It allowed Roshawn to get his handcuffs on the suspect who is 32 years his senior.

TriMet police arrived and arrested 47-year-old Jared Green. He was charged with fourth degree assault.

Idon't want to see someone die, said Lenkau. Iwas there and could've done something about it.

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