The lower pipelines may continue execution until the mispredicted branch instruction confirms, at which time {HEAD ~ all uncommitted instructions} are flushed from {TAIL ~ the lower pipelines} 
are flushed from
The lower pipelines may continue execution until the mispredicted branch instruction confirms , at which time { HEAD ~ all uncommitted instructions } are flushed from { TAIL ~ the lower pipelines }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL