Sorry if this dosent make much sense. Basically Oliver has been gone for 1 year now, and everything has changed. Felicity has now become the scarlet night [hero I made up, bad name ik] (Based in. season 3 ep 10, when Oliver has gone off to fight whats his face) Starts of with a flashback and Felicity had just attacked some people but failed.
It had been to long. Oliver had been gone for too long. Felicity paced around. "John" Felicity said "I can explain"
"Felicity, I know" Diggle replied "Oliver's gone, but that dosent mean that you have to go out in the middle of the night and try to do him justice, thats not how it works"
"Your wrong John, it wasnt justice" Felicity shook her head "Olivers gone and we have nobody else to protect us, what did you expect me to do? Just sit down and wait patiently for his return while people suffered?"
"Felicity, you could of got hurt.. you could get hurt" Diggle held her shoulder.
"I wont if you teach me" she replied putting a brave face on.
Diggle smiled "Lets start with your code name"