The Originals 1x12 Dance Back From The Grave --- Cami did say she was on Vervain but it wouldn't be a problem for Marcel since in an earlier episode Marcel was seen directly ingesting vervain. At the time he reasoned that as the one responsible for running New Orleans, it is ideal for him, as leader, to keep his vulnerabilities at a minimum. And in House Of The Rising Son & Tangled Up In Blue it is mentioned by Klaus that Marcel makes sure that he and his entire crew take Vervain to prevent The Originals from compelling them. That is why Klaus had Joshua drain the blood of Marcel's minion before he could set Thierry up.
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03:28 Klaus & Cami save Marcel & Haylijah Free Rebekah 01:09 Papa Tunde Vs Rebekah - TO 1x12 ...