After they received a call of a "dispute with a knife," officers arrived at the specified location and found two men pointing at Carlos Reyes.
Without asking for any information, the cops opted to pursue Reyes and eventually captured him. Of course, he happened to be carrying a gravity knife and a gun replica, and was arrested.
At his trial, Reyes wanted to prevent the introduction of the recovered items and the statements made while in custody, claiming there hadn't been an appropriate legal basis--or "probable cause"--to arrest him. After the New York County Supreme Court denied that request, and he was convicted of "attempted robbery in the third degree," Reyes appealed.
In the absence of the perpetrator's description, and because officers failed to interview witnesses at the scene (or ask why people were pointing at Reyes), the Appellate Division, First Department, thought the apprehension lacked a "reasonable" basis.
(Because flight alone wasn't enough to justify the pursuit, the weapons and statements were found to be inadmissible.)
Looks like you can run and you can hide.
To view a copy of the Appellate Division's decision, please use this link: People v. Reyes