May be it ll be interesting for someone. These are 3 demos with simple rj, which i ve investigated evently.

@dm6,j+rj4(2nd-stair)2ring_with_51_hp

and this is utmost rj (which is possible from the rest state) but with 52 hp. I couldnt do it with 51 hp yet.
@dm6,rj4(s2nd-stair)2ring-respawn

@dm2,rj4(5th-stair)2mega_with_50_hp

I think they take place coz the rox explode exerts onto the edge of stair. May be these are old enough, but these things are strange for me.
Same things took place on KTX-based mvd-servers, but new versions had already fixed thermometer.