You can use #scan and #mem to pick up tiles near to the character and put them over him, "erasing" him from the screen. Then do #TargetLocation(x!,y!) to get the location of the enemy (you'll have to multiply the values by something to get the positon right, because that will give you tile coordinants and you need pixel coordinants), then a normal animation of the character performing the move.
If you have the original Dark Age downloaded, take a look at "slash.prg" and "wyvern.prg" for some examples. I'm not sure how well this method will work in TK3, though.