This block is a gate that prevents Mario from riding Yoshi through, without outright killing Yoshi. It will force the player to dismount Yoshi, and optionally stop Yoshi from passing at all (preventing "throwing" Yoshi through the block with his momentum).
Useful if you want to restrict Yoshi within an area, but also allow the player to return to him.
Requires a small hijack to prevent cheesing Yoshi through the block with quick mount-dismounts. An unpatch is included.