Motsoako oa acetylene le oksijene, haeba e hotetsa mme e etsa hore moqomo o tloaelehileng oa khase o phatlohe, e fella ka ho shoa ho itseng ka har'a radius ea limithara tse leshome. Ntle le kotsi ea ho otloa ke li-cylinder shrapnel, the immediate negative pressure and the blast wave from the explosion are powerful enough to be deadly.
I personally consider a distance of up to 20 meters from the explosion to be fatal. This scenario is exceedingly perilous.