Itís one of those what would you do moments.
You see a plainclothes police officer struggling to handcuff a teenage robbery suspect on a SEPTA subway platform. Do you step in to help? Do you call for help? Or, do you just walk away?
On Thursday morning around 9 that was the decision commuters faced after a plainclothes SEPTA officer tried to takedown a 14-year-old who can be seen trying to rob a University of Pennsylvania student waiting for the train.

Investigators with SEPTA Police say that it all started when two teens appeared to be following the student as she looked down at her cell phone while on the platform at 34th Street on the Market-Frankford Line. When they all got off at the 30th Street stop, one of the teens allegedly tries to grab the studentís phone and thatís when the SEPTA Police Sgt. Tim Catto -- in the video you see his face blurred to protect his identity -- jumps in.
Sgt. Catto struggles to bring the teen who took the phone under control. At one point a man steps in and helps the officer as the unidentified suspect tries to get away.
"I kept saying youíre under arrest, youíre under arrest," Catto exclusively told NBC10's Rosemary Connors. "He was actively resisting, trying to flee, trying to talk me into letting him out."
As the video runs other bystanders are seen calling for help and one even helps the victim who suffered a cut during the incident.
The boy's alleged accomplice ran off.

Not many people Connors spoke to Thursday night on the subway said they would step in but some did say they would at least call 9-1-1 -- and sometimes that's all that's needed.
"Iím gonna get you some backup, Iím gonna get you some assistance is a tremendous help," Catto said. "We need more people like that."
SEPTA Police say the suspect, who is from West Philly, told investigators he was trying to get money to buy a video game. During questioning, police say the teen admitted to at least three other similar thefts since late November.
Police didnít say if the teen would be charged as an adult or juvenile.
Catto's police work got high praise from his boss.
"He followed the suspicious people, he captured the person that committed this crime -- victimized a Penn student -- thatís great police work," SEPTA Police Chief Tom Nestel said.

See the video here: Caught on Cam: Teen Taken Down for Attempted SEPTA Robbery | NBC 10 Philadelphia

I'm so glad that little bugger got caught. I ride SEPTA's subway, and on an automated message, it says "Please secure all electronics". Even on the platform, there is a sign that says so as well. Folks are not even safe to text. Damn kids. Lately, there have been shootings down there. This stuff pisses me off!