My partner worked in a Research School of Chemistry. On the top floor of the building a tip-over failure replacing an argon bottle broke the valve off the end

My partner worked in a Research School of Chemistry. On the top floor of the building a tip-over failure replacing an argon bottle broke the valve off the end and emptied the compressed lot of Argon in short order. Argon being colourless, ordourless, heavier than air = whole building "anti-suffocation" evacuation. But no fire problem!