In the encore , there was a water screen that pumped Motion two tons of water into the stage ; this was considered one of the signature performances of the tour Traveling .

The crew mistakenly shut down Being_in_operation the functioning engine , and pumped Motion more fuel into the malfunctioning one , which burst Motion into flames .

after the murder Killing of two female hostages two-and-a-half days in , spetsnaz operators from federal security service ( fsb ) alpha and vympel , supported Supporting by a russian ministry of internal affairs ( mvd ) unk unit , pumped Self_motion an undisclosed chemical agent into the building 's ventilation system and began Process_start the rescue operation .

All but two of the hostages who died Death during the siege were killed Killing by the toxic substance pumped Self_motion into the theater to subdue the insurgents .