At the very least, slow would turn sliding moves into single steps, and immobilize "ski" moves.
That depends on how you look at it. If you see the ski slide as a degenerate bent rider (e.g. D-then-R), and you would allow a pure D to make its leap even within the Hia zone, it would be logical to allow the D-then-R its first (D) step too. Just like you would allow the Griffon (F-then-R) to make its F move.
Even if it was a lame ski slide, like the Tamerlane picket (nA-then-B), it would be logical to treat it as nA. But it is a matter of taste how that should be treated. I would be inclined to allow it its move, rather than completely immobilizing it.
That depends on how you look at it. If you see the ski slide as a degenerate bent rider (e.g. D-then-R), and you would allow a pure D to make its leap even within the Hia zone, it would be logical to allow the D-then-R its first (D) step too. Just like you would allow the Griffon (F-then-R) to make its F move.
Even if it was a lame ski slide, like the Tamerlane picket (nA-then-B), it would be logical to treat it as nA. But it is a matter of taste how that should be treated. I would be inclined to allow it its move, rather than completely immobilizing it.