English is not my first language, so if you find some mistakes please, forgive me and write me, I really want to improve!
Smoke.
Gray smoke was coming out of the windows of the 221b Baker Street.
John dropped the bags on the tarmac, ignoring the water bottle breaking down, the milk pool that began to spread on the ground.
He ran to the door of the building, banging it with his shoulder, a grimace of pain painted on his face.
He climbed the stairs two at a time, kicked the wooden door of the apartment, rushing in, "SHERLOCK ?!" he shouted, trying to find him among the immense cloud of smoke that was spreading quickly throughout the flat.
Burning smell.
He rushed into the kitchen, where his flatmate kept his most dangerous experiments, "SHERLOCK!?" He cried, rushing toward what looked like a human figure.
The man's body was bent over the table.
"Sherlock, for God's sake, are you ...?" Watson put a hand on his shoulder, turning him sharply.
"John - greeted the detective with a smile, holding two stalks of celery in the hands - hello. Just in time. Remove the meatloaf from the fire or it'll began to char. "