What is going on?

POV The good soldier Sveik:

Sveik's hand trembled, the rifle almost slipping from his sweaty grip as he peered through the thickening smoke. Explosions boomed and gunfire crackled, creating a symphony of chaos around him. His finger twitched nervously above the trigger.

"Graah!" From the distance, a primal growl shook the ground, mingling with the shrill screams of pain and the relentless sound of shooting.

Sveik gasped for air, his chest tight with fear. Even blinded by the smoke, he sensed the alien creature's approach, its ominous presence sending shivers down his spine.

'It's just a nightmare,' he whispered to himself, desperately wishing for the surreal horror to dissolve. But the relentless explosions, the sharp scent of burning, and the metallic taste of fear in his mouth anchored him in the grim reality.