This is a very specific situation that may never come up again but here goes.
Greedo has line of sight to Vinto and Onar. Greedo declares an attack on Vinto. Vinto shoots first and does damage to Greedo but doesn't kill him then Vinto plays opportunistic and gets out of LoS.
Is Greedo able to attack Onar or is that declared attack on Vinto simply gone? If Greedo can shoot Onar does slow on the draw trigger again?
Thanks for reading.