re: Slight difference
You do not have a reliable eye witness to the way in which the effects were caused.
The witness was the farmer Renato Nicolai, 55, on whose property the UFO landed and then took-off almost immediately. Thinking that it was a military experimental device, Nicolai notified the local gendarmes on the following day. The gendarmes interviewed Nicolai and collected soil and plant samples from the landing site within 24 hours of the occurrence, notifying GEPAN on January 12 as part of a cooperation agreement for UFO investigation between the two agencies. Further collection of samples and measurements of the site were undertaken by the GEPAN team, and the samples were thoroughly analyzed by several government laboratories.
http://www.bibliotecapleyades.net/ciencia/ufo_briefingdocument/1981.htm
Your hypothesis is still flimsy compared to the scientific way in which this "event" was investigated.
