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The explosion in the sky was a signal for help, something only used when a person of the Burning Lotus Sect is in grave danger. Though, not every disciple of the Burning Lotus Sect is given such an item, as mostly Sect Elders or Core disciples would receive them due to their importance to the Sect.
And according to the Burning Lotus Sect rules, one must stop whatever they are doing to answer the call for help if noticed, especially Sect Elders, even if they are aware of the danger ahead.
When the explosion occurred in the sky above the Burning Lotus Sect, various Sect Elders and Core disciples within the Sect that noticed the flames immediately stopped whatever they were doing and began heading towards the site where the explosion appeared.