Arthur sees through trick

So, he brings Guinevere home, and they are greeted by everyone. Many presents are given. And Arthur and Guinevere kept all of them…. except one. Morgana sent a servant with a very pretty cape for Guinevere, but Arthur looks at the servant and goes “My evil sister, who hates both of us, sent a present.”
And the servant is all “Yes?”
Arthur stares daggers at this woman and calmly says “Put the cape on.”
“Oh, my lord, I could never presume to-” The servant begins but sees the look in Arthur’s eyes and shuts up.
“That wasn’t a request. Put. It. On.”
She does, and bursts into flames because of course it was a trap.

Arthurian Myths Retold pg 50-51