Thanks. I am sorry about misunderstanding. Stop cards don't stop previous action, but they - when they are active - stop Eve on previous tile, if she moves to them. It simply turns tile to an impassable one.
No worries! That's what I've thought! And it nicely worked with the Rock-snake, but with the cactuses I must have done something wrong. That's okay though it still doesn't change how nice the game is to me!! ^^
The only difference between cactus and rock is that cactuses has to be placed on grass. The possible mistake also can be, that you has to play the card before Eve goes there.