Code help in ops.go

when i read code in warp/pkg/bench/ops.go, i have a question:

Lines 516 to 517 in 042a9fc

    
           bStart, bEnd := o.FilterByOp(b).TimeRange() 
        
           firstEnd, secondStart := aEnd, bEnd

firstEnd, secondStart := aEnd, bEnd why not firstEnd, secondStart := aEnd, bStart? Is it a mistake?
i see the code next:

            if bStart.Before(aStart) {
				firstEnd, secondStart = bEnd, aStart
			}

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	bStart, bEnd := o.FilterByOp(b).TimeRange()
	firstEnd, secondStart := aEnd, bEnd