Wave them down. If they don't stop, get a description and pass to dispatch while pumping home to get my truck and persue.
My teenage daughter works at the 'greasy-spoon' about 20 min. away so I'd never be on a bicycle. She's got lots of friends and I don't know all thier(or thier parents) cars, but I know thier faces. If I encountered a like sceaniro while picking her up in my truck, I'm following, calling her cell, ......no answer......calling 911 and getting/passing info. My daughter would ask to stop if she saw me, so not stopping would be avery RED flag. I'm NOT drawing my sidearm just because they didn't stop. Too many variables and unknowns.