Question about Masters of Corruption quest

This is a silly question, but I can't find a straightforward answer in any of the other threads on this quest.

I decided to "Drink from the Chalice of Corruption" and then accepted the "Masters of Corruption" quest.

If I decide to abandon the quest, will I be able to go back to Brother Tosai in Waijun Bazaar and choose "Refuse to Drink" quest, and then follow up with the "A Monstrous Revelation" quest?

Or if I abandon the "Masters of Corruption" quest, is it over and I won't be able to get the "A Monstrous Revelation" quest from Tosai?

i drank the chalice and did the quest with my ranger that reached there first, and completed the sequential quest, when i reached with my monk i refuse to drink and kept the chalice but didnt got the quest after, so i walk around with a chalice and the arm fah dont harm me, lol, i didnt try to abandon it, and get the chalice again, i might do this l8r to see how it goes, the fact is i got 3 of my chars that are with this chalice and walkl through the arm fah with no harm.

Yea..I find it funny how if you just don't take the quest, the Am Fah are always nice to you

Anyone know the answer to my question?

I've looked on another website and there were some really old responses (from the preview event) that seemed to indicate that if I abandoned it I couldn't get either of the quests back, but I wanted to make sure...