Misha said that we're going to see the "cosmic consequences". I wonder why nothing happened when Dean killed death. What do you think?
what i think is, dean killed death without consequences because it was meant to have no consequences. it was an emotionally-charged moment where the sole action of killing death instead of sam held a huge meaning. the fact that it had no consequences is… nonsense, but it was a story the writers didn’t decide to pursue. they went with the consequences of amara being freed instead.
as for cas, first of all, he’s broken a pact bound in blood. billie specifies that the consequences are happening if the brothers break the pact. it’s not billie’s death that messes things up on a cosmic scale, but the breaking of the oath.
i was also considering that maybe the consequences won’t fall on cas’ back only. what if they fall on those who made the pact first?
anyway, im not saying that dean killing death with no consequences makes sense, but from what i’ve gathered it’s a completely different situation.