Batman At SFGAm is an invert with a catwalk on one side of the lift. All B&M inverts and flyers have Lift Unload Platforms (LUP).
Anytime a train needs to be emergency unloaded, usually a member of maintenance will operate the LUP. Maintenance and members of management (supervisors/full-tim) will assist the guests off the train, onto to the LUP, and onto the catwalk. Then, depending on the park and emergency procedures, two employees will then escort a portion of the unloaded train back to the station (usually one or two rows).
On a side note, climbing the lifts/catwalks can be a lot of fun.