Any stun triggers 7.5sec stun immunity (eg. charged weapon stun, fireball stun, singe AA stun, etc.) - the panic/terrify though (both the exact same thing, just different name) don't have this immunity. So yes, what you described is very possible.
A panic/terrify immunity has been discussed, suggested and approved several times but to no avail. Not enough people care about it for things to change, I suppose.
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