initiating {HEAD ~ a download} of a selected file segment of the suspect file via {TAIL ~ a specific external identifier} on the file sharing network 
via
initiating { HEAD ~ a download } of a selected file segment of the suspect file via { TAIL ~ a specific external identifier } on the file sharing network
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH