Here's a good start on the meaning of flurry...
a number of things arriving or happening during the same period.
"a flurry of editorials hostile to the administration"
synonyms: spate, wave, flood, deluge, torrent, stream, tide, avalanche;
If SS agent Kellerman's testimony was taken seriously, the WC would have responded differently... Instead, they tried to lead the witness with hints and suggestions to coerce him to say he meant two shots, instead of a "flurry of shots."
And again, two does not equal flurry... and note, he used the word at least twice in his testimony...
Also, two is not a wave or a flood or a deluge or a torrent or an avalanche...