2 quick questions
Are you allowed to place a knight on top of another knight?
Are you allowed to kill a royal (with say a 21T) if the other card in the overload is a knight?
I assume the answers are no and then yes, but I wanted to make sure
You are correct!
A knight cannot be placed on another knight.
As long as the card triggering the overload is not a knight, an overload can include a knight (the value of the knight would be 0).
Sweet! Thank you!