Medivh is casting spells in crow form

Fix this exploit pls. It is ruining games at the moment since its broken. To reproduce it, you need the ultimate upgrade for Polymorph, which lets you cast Polymorph in an area. Right after you change form, you should use the upgraded Polymorph. This will cause your entity to stay in crow form, but the game will still treat you like a regular hero. This means you can use all your abilities without having to leave crow form.