Artemis
Robin was like the little brother she never had. The little troll that she would do the whole 'ride or die' she kept on hearing about for. Well technically that's for the whole team, but it still stands. Robin was the little brother she never got to have.
And as the daughter of two criminals, and a highly skilled fighter, she can tell when something is wrong with Robin during sparing or when they were out on the field.
This includes changing fighting styles slightly to the left, and a little more Gotham street fightish, and doing something that he most certainly didn't really mean to do.
She wants to ask what was up, but Artemis thinks that he wouldn't give her an answer. He certainly wouldn't give one to her right then, as some creeps were trying to kidnap Robin.
As to why, they didn't say. Except they had a gun and Artemis and Robin were in their civvies in Happy Harbor, trying to grab groceries for Megan.
"Just come with us kid, and no one gets hurt." Goon number one rasped. He seemed very confident of himself.
Goon number two on the other hand… he was shaking like a leaf. That one would be very unpredictable.
And a freaking black cat had to set him off.
Bang!
Right into Robin's right arm. Artemis' eyes grew wide as she saw the bullet pierced right through as if his arm was butter.
Everything slowed down, and Artemis could watch how Robin's face shifted from shock to down right murder.
Time fast forward again and it wasn't Robin that was fighting two would be kidnapers. No, it was something like Batman that ran with furry. Not a single patch of skin was shown, just all pitch black without a cape. Just the iconic ears on top the helped showed that this, this was a bat. Not a bird.
It was as if Robin was no longer there.
And as they went down, as the not Robin calmed, civvies came back into view.
Robin was her little brother. That was not her little brother. Whatever it was, it did not like Robin getting injured.