Dabi (toya) and some league members were on a camping trip, sort of. They were waiting for some hero students who would turn up to this location the next day

Though one of the members bought marshmallows for some reason... And was now begging Dabi to help them toast it, while offering him some. Reluctantly he agreed

Dabi would use his fire at its minimum level and toast them a marshmallow while muttering "This is some serious business and you bought stupid camping snacks?"