Just so I get this right. When Billy and Finney started shooting out the back of the passenger car... 

One of the riders, on a white pinto planned to board at the rear of the passenger car, but backed off because of the shooting.

[quote](a) shorter figure riding a brown and white pinto...[/quote] 

the rider backed off complaining there were more guards than they expected. But Bobby and Sparrow are now a more immediate threat to the guys at the front of the passenger car; Sergio, Misti and Taylor...

[quote]Bobby and Sparrow have brought their horses up beside the little platform at the back of the express car.  The Navajo man grabbed ahold of the railing and made the transfer from saddle to train with surprising ease.  Bobby, still in his saddle, pointed his revolver toward the passenger car door...[/quote]

Do I have that right now?

I ask because I just read Ed's post for Sergio and it appears he turned to head for the back of the passenger car?

[@Kelewen][@Eviledd1984]