Right Behind You

Spoiler: Trick List

B:
- quick slide (this will force B thru a railing)
- auto pilot (tap and slide slider to redirect B)
- wedge step (B can step off a wedge)
- stairs side step (with B on the stairs, tap behind B and then to the side)
- long legs (with B on inverted stairs, tap away and B's legs will grow longer)

R:
- auto pilot (as R climbs up stairs, R's leg grow, slide slider to redirect R)
- elevated eye (this will change the property's of the block above to No Pass)

Spoiler: Video Solution

Rails and draggables are always awkward and this was no no exception. How to get B in position to block R who very unhelpfully can walk straight across the empty rail. My gameplay was similar but i used a stack to get B across. When B has the vital block on R , I had less moves than the video and didn’t bring B back across although i had experimented with the clever autopilot but found I didn’t need it. Loved the solution to the impossible autopilot.

Great idea for eye elevated..
New concept... For me
I use video for last part

Excellent. But I found a clean logic way to complete the first part without using autopilot either long legs .Ahh, and due to the last update I figure that R had to win. Thank you @Meko Guy