wlad thought this would be an easy fight, he thought chisora would be scared, he made a big mistake and then he chickened out.
Wlad's girlfriend took him out to a big fancy big shot actors party and they went on an all night crack binge like those Hollywood types love to do. Wlad knew he'd fail the post fight drug test, so he faked being scared of Chisroa by faking a tummy muscle injury. It's pretty obvious that's what happened. This is why boxers should not date actresses from crappy TV shows...look at what Robin Givens did to Mike Tyson!