It shouldnt though as description of the synergy says "the first time when you would be knocked out". Obviously his sig ability saves him from being knocked out"
From a technical standpoint, if you take a hit that would normally kill you:
Corvus' ability checks to see if the hit would kill you. If it would, the ability would instead remove 4 Glaive charges.
Heimdall's ability checks to see if the hit would kill you. If it would, the ability would instead grant you temporary invulnerability and unstoppable while leaving you at 1 health.
Both of these checks are done at the same time. Neither one triggers before the other triggers.
I'm not sure if this is intended when using NF before I die and go to my second phase It will trigger with heimdall on the team so I think they need to rework him
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Corvus' ability checks to see if the hit would kill you. If it would, the ability would instead remove 4 Glaive charges.
Heimdall's ability checks to see if the hit would kill you. If it would, the ability would instead grant you temporary invulnerability and unstoppable while leaving you at 1 health.
Both of these checks are done at the same time. Neither one triggers before the other triggers.