Salvia immobilizes me. I've only moved around a couple times when I first started to smoke it, and only once did I end up in another room. I think I may have learned to overcome the impulse to get up and move about somehow. I always used to tell myself that I wouldn't move before I hit it, and it worked. I don't even say that to myself anymore, because I never move. I get extremely off balance from just one hit of plain leaf, so I imagine if I did move, it would be much like a drunk person, falling and laughing. I rarely do hits of extract, however. But even when I do, I still don't move a muscle.
DMT on the other hand...I smoked one of the larger doses (for me) recently and I "came to" still on my bed but completely wrapped up in the blankets and sheets, as if I had been doing a gator roll. Was kind of frightening, because I couldn't remember doing it, or which part of the trip would make me want to spin around like that.
And as for the OP, it's not always as simple as Leary puts it, but that would helps things enormously. Just do Salvia when you're in a safe place, ground level, no high places that can be climbed, etc.