MITCH PHILLIPS  WHEN race commentator Steve Cram announced "this is not normal" midway through Sunday's London Marathon it was something of an understatement as Eliud Kipchoge, the most dominant performer the distance has ever seen, was finally looking mortal. An hour later, Kipchoge trailed home eighth in a time six minutes slower than his own world record and over a minute adrift of Ethiopia's Shura Kitata, who won the race after a spectacular sprint finish in two hours, 05.41 minutes. The Kenyan had finally cracked just under three miles from the end, later saying he was suffering from a blocked…