"Bang bang bang." Bullets strong enough to penetrate mecha armor struck the stone door, chipping away chunks of stone, yet the door was impressively resilient, not shattering. Song Yun's figure suddenly shot up again, the gunman exhibiting remarkable marksmanship, the bullets closely trailing Song Yun; but Song Yun's speed had the upper hand by a fraction.
It took less than 3 seconds for the sentry's heavy machine gun to fire dozens of rounds, many striking the door and causing the entire stone structure to rumble thunderously.
Song Yun charged straight to the front of the stone door and, seeing it was already damaged, delivered a punch combined with Inner Strength and short-range power, instantly reducing the door, previously battered by the heavy machine gun, to rubble and twisted rebar.
Song Yun dashed into the building.