So that bowl the guy has to drink is actually gonna be spiked with a fatal poison, right?
Tolui is "a hero" for the Mongols.
Don't know about drinking from the bowl, but in the Secret History when the shamans "revealed" what the curse demanded for being lift from Ogëdei "coincidently" just at the right moment
Tolui walked in... he hears about the situation, says "makes perfect sense for me" and accepts dying for Ogëdei as a great honor.
It's funny if you think that all the people seeking power killed the only one of Ghengis's sons that didn't want any more power than he already had.
Tolui holding so much power would keep everyone in check, no one would have enough power to challenge anyone else for decades.
And now think about the another irony.
If Sorghaghtani hadn't sent Fatima as a spy maybe Boraqchin would had died and Ogëdei wouldn't poisoned by the realgar. Sorghaghtani desire to "prevent" the family from fighting and killing itself was what started it all.