ARROWS1, E8
Vendetta
As Oliver and Helena grow closer, Oliver trains her to be his ally, complete with showing her how to use a crossbow. Diggle disapproves of Oliver sharing his secret with Helena as he's not sure she can be trusted, but Oliver refuses to listen to his concerns. When Helena's quest for revenge proves to be too strong for Oliver to handle, she kills the head of the Triad and all hell breaks loose.
