The stage was a bit too much for Girls' Generation's "Party" as the girls attempted to perform the full song during the DMZ Peace Concert on August 14, but had trouble near the end from coughing fits caused by all the smoke from a fireworks effect on stage. 

The sparklers, which in themselves look quite dangerously close to the girls, sputtered around the group after they walked onto the adjoining stage at about 2:47 above. Seohyun, Taeyeon, Hyoyeon, among others could be seen struggling and taken aback by the smoke, but most of the time, they attempt to be bright and cheery while stifling coughs, which can still be heard through their mics.

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Like true pros, the girls went on with the show!  Hopefully, though, they won't have to deal with such a troublesome environment next time.  You can see more from 2:51 below.

[Thanks to everyone who sent in tips!]