Vorgrok takes the moment to adjust his grip on the handle of his heavy sledge, preparing to bring it down upon who- or whatever- emerges from the door...

Spoiler: Actions
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Can't Rage and then ready an action because readying an action requires "concentration"...

So, readied attack: (1d20+9)[17] for (1d12+4)[6] damage

Spoiler: Stats
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Vorgrok Giantforge
Level 3 Neutral Neutral Dwarf Barbarian. Speed 20 ft, Medium Humanoid (Rock Dwarf), Rigger
AC 19, Fort 9, Reflex 6, Will 9, Perception 9
Rock Dwarf Heritage- +2 vs shove/trip/prone effects, half forced movement over 10 ft
Dwarven Darkvision
Abilities Str 18, Dex 14, Con 14, Int 10, Wis 14, Cha 8
HP 23/55

Conditions:
Clumsy 1 (-1 to Dex-based DCs/checks) while wielding Large weapon