My guess is Adams dramatized her testimony, in talking with Mark Lane and others.
The LHO-Baker-Truly lunchroom encounter occurred as depicted, maybe 90 seconds after the JFKA. Sandra Styles has indicated she and Adams lingered at the windows after the JFKA.
My best guess is LHO fired three shots in the direction of the JFK limo. In earnest or deliberate misses as part of a false flag op, I don't know. There were three wild misses of the JFK limo that day in DP by many witness accounts, although only three or four loud gunshots were heard. Three loud gunshots were heard inside the TSBD.
So who fired at the limo, but missed so badly they struck a manhole cover off of Elm, a curb by Tague and behind the limo on Elm St?
I don't know.