1) Start by placing all the elements to render (enable) post-blast.
Scorch decal, flickering light, animated fire, and a trigger bound to ignite those who enter it.
2) Then place your explodable prop (ie: barrel/canister, etc)
3) Link all post-boom visuals to the canister via "Enable Parent", and set the state to opposite (meaning when prop is disabled, others are enabled).
Done!

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