Pretty sure he was filming his scene for 319 when that happened,
Well Adam later said was reshoots, but again doesn`t matter now.
Based on the latest spoiler, is probably safe to say Sean is filming scenes probably with Rose presence, and they are filming it now, bc only now she is available, and wasnt available to film 614 since she was filming Izombie.
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"I offended you with my opinion? Ha, you should hear the ones I keep to myself".