[OFFTOPIC]
We can safely assume that the demonstration fire in this sequence was extinguished.
FOR, it for sure is. Look at this video, it's Be-200, so it's half the amount of water but still:
https://www.youtube.com/watch?v=0BzGPTuAGqo.
This is very good video about operations of firefifgter based on Il-76TD:
https://youtu.be/89vm_Q_8SlQ