Has this actually happened, I always seemed to catch the races where he ran in the 46/45 zone
"Truth is, Bolt and Rudisha at 400 isnï¿½t a fair fight. Bolt has run 43 splits, Rudisha isnï¿½t 43 capable. At 500m, though, you have a race." -- Ato Boldon
I'd expect Rudisha to similarly be in the 45 zone.