A sphere of white flame manifests above the armor and surges downwards, but the armor moves with jerky mechanical motions to sidestep the flame, which dissipates against the floorboards. Without second guessing, Anton uses the railing to leap over Kellon, landing behind him on the stairwell, out of reach of the haunted armor.

The armor reaches back and swings a metal fist towards Gweyir's center of mass, but she parries the blow with her sword and backs away, sidling past Kellon onto the stairs between him and Anton. The armor begins to lumber after with slow, deliberate steps.

Spoiler: Combat Log
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Animated Armor passes its Dex save vs Sacred Flame.
Anton uses Disengage, and moves behind Kellon.

Animated Armor attacks Gweyir, but misses.

Gweyir uses Disengage, and moves behind Kellon.
It is Kellon's turn again.