Yeah you've got it right, the normal is like the Sheeva stomp, coming from above. The enhanced would be a straight launch across the screen, with a tackle.
Just a heads up to everyone, I'll be making a post with some Tremor Special Moves concept art I drew up. Its specials that I think would fit him well without making him overpowered but definitely landing him in high tier for tool sets. It should be up soon, let me know what you guys think!