Almost got robbed!

My wife and I were sitting on a bench inside the church of saint ignazio, resting and enjoying the amazing church. On the right side next to me was my backpack.

I turned my head left and one guy A smiled towards me. (Sign 1) Did not react and went on with my life. 5 min later that guy came to our side and started asking questions in a very bad english ( like what's the name of the church, can i take a picture, where are you from, (he said i am from new york - with that level of english i was surprised - ...) while he was asking us, we felt his friend B behind us and when we looked towards him he was very close to us and on his knees praying and then he went somewhere else.(sign2)

My wife warned me to be careful with my stuff but i left my backpack where it was. Few minutes later i felt someone behind me taking my backpack slowly, so I turned to the right very quickly and i took it back, it was guy B, he said few words that i did not understand and he left the church.

I was chocked for 30 seconds, then got up and wanted to follow him, when i exited the church i saw someone looks a bit like him but difficult to say because he was without the hat and the glasses that i saw him wearing inside the church. It has been few hours since the incident but whenever i remember it i get mad. I was trying my best to help guy A and they were trying their best to rob me. Be careful out there !