Code help in ops.go

[shencong1992]

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

warp/pkg/bench/ops.go

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
			}