Olver blows the Horn of Valere and the pattern spits out all the heroes to come and save the day.
But, he really shouldn't have been able to do it since Mat is supposed to be the designated wielder of said artefact. What am I missing?
When Rand attacked Caemlyn, Mat was killed by Rahvin, breaking his connection to the Horn. He was brought back by Rand balefiring Rahvin, but apparently anyone could have blown the Horn after that.
Mat's connection to the horn was severed, because he died and was brought back to life. I interpreted his comment about dying to be referring to the scene in Rhuidean, when he was hung from the tree.
I understand the reasoning - however. Balefire erases the actions of the one struck - if Mat was "brought back to life", it means he never died. Therefore he was never severed from the horn. Yeah, its a fantasy novel, and one can't expect perfect logic. Nonetheless, this has always seemed a bit ridiculous.