You don’t need any talent to cast iceblock!
My guildie respec from trainer and lost all his talent point.
Now he is still able to cast old talented spell with no talent showing on the interface and 0 points left.
Of cause with all addons disabled.
Nothing can save his account now. No talent points useable and 50g wasted.
Ok some more details, his old spec does not even have ice block. It was a deep arcane/frost raid talent he wanna spec into deep frost. Suddenly he has iceblock for free.