>> reporter: clearly nervous, colette barely slowed down as we approach the church tiffany and david hartleyber 30th. he turned the boat and gave us 30 seconds to take the pictures at the exact spot tiffany hartley said they had stopped. >> this is the last place they came to at the old guerrero church. they took pictures on the front step, according to tiffany hartley. and they set down this channel to head back, and it was about five minutes into their voyage when they were approached by the boats. in an instant, the man who told us this lake was safe was again speeding away from mexico 70 miles an hour. the same path the hartleys were on when tiffany says the attack began. >> there's a boat on our left and two on our right. on kind of towards the land, we're kind of in the middle of the lake. and then that's when he motioned that we needed to go. >> reporter: did you see something in his eyes that said, this could be serious? >> i could just tell by his body language. you know, i saw him and he was just kind of, we got to go. like, this is serious, but he stayed behind and stayed between