The answers are expected ones. If Askinadzi had known anything about fireballs and frightened soldiers, he would have told that already.
Askinadzi tends to map Kuzminov's story about fireball to March 31, when Sogrin, Potapov, and Avenburg saw a fireball's flight. I doubt very much that Kuzminov talks about that event. From his letter it is clear that he was not at the Pass with the 1st shift of Ivdellag soldiers. He refers to another soldier, Borey, when he talks about March events, which means he did not witness those events -- arrived to the Pass later.
The point is that helicopter's pilot Potyazhenko and his wife, who worked as a radio operator in Ivdel airport at that time, both separate two episodes with fireballs. They say that the episode described by Kuzminov occured later than Sogrin's episode, probably on 23rd or 24th of April. Three people talking about a fireball appearance later than March is enough to take it seriously.