TH Procing

[Arcon]

You need to have performed an action of the target. Simply being on the hate list/having enmity isn't enough (IE curing someone with hate will not tag TH).

That is correct. And you don't even need to be on the hate list at all, if you die, for example, TH will remain on the mob.

And yes, as others said, you don't need to see a message to have TH. The message is just for upgrades. If you get a TH message "TH effectives reaches level 7" or whatever the exact message is, it means that TH6 was on before (unless it was the first hit, which is irrelevant for this discussion).