how does this piece move?

I would hope it moves just like any other knight - going in one direction for a while before suddenly veering off to the side and coming to an abrupt stop.

Like a normal horsey, but the square it leaves behind remains on fire, destroying the next piece to land on it.

Only the most recent square it was on remains on fire.

Considering what it's on: either forwards or backwards.

Same as a knight, but twice in one turn. And the player has to say "zoom" while moving it and "screech" when finished.

It stops, drops, and rolls, in an L shape.

A horsey on fire is like a normal horsey but it only moves once and than it burns to death

It moves like a normal knight but leaves behind a trail of fire for the next 2 turns. If any piece crosses or lands on it, they take 1d4 damage per turn in the fire.

If it's on I-5 in the CA central valley, it's doesn't. It sits in the fast lane right next to its buddy blocking traffic for 50 miles. Then it can't get it up when ol' Tehachapi comes a callin.