there is no option to self cast when using an 'alternative cast' method, no prompt appears ether. seems like no reason for it to not work so it seems like a bug. (did find a weird way to do it on 'hold to cast', you have hold the alt cast button down then deselect the spell.) also if this gets fixed different text prompts for self casting when using alt cast would be nice too. telling the player to double tap the button or hold for witch cast option you have and not have any confusion.