I honestly view the Greyhound bus as a cattle cart. Something I've never rode on once in my life so I simply didn't know.

It was never my responsibility to follow anyone, and in fact Brosnan prohibited it, yet ignorant Walmart employees would try to hoist that on me until I had to set them straight, especially with the racist tone it had.

I would be approached by a cashier. Usually the one supervising a self checkout or even a greeter. Also when I'd do an entire perimeter sweep of the store and doing so I'd be approached by a staff member staying to the effect that they don't like the looks of someone that just so happened to be some brown.

Asset protection people really just walk around the store in regular clothes and start to follow people they determine to be sketchy. They will talk on a company phone to an AP in a office or one also walking the store.

Just so you know the AP office is the door. Just to the left while you walk in through the pharmacy side entrance it's almost always unlocked and the APs have zero right to detain you. If they ask you to go into their office it's not a detention hence the unlocked door. Feel free to run.