It's because there is rumours going round the internet that Redknapp will return to Portsmouth to sort out the mess. He's denied it though and it's only speculation so I wouldn't worry to much Tottenham fans. Although, he denied he would go to Southampton from Portsmouth, and he did. He also said he wouldn't leave Portsmouth for atleast another season after we won the FA Cup, oh wow, again, he lied. The betting slash is mainly because a lot of people have betted on him being the first manager to get the sack or leave at something like 100-1, so they've slashed it so they won't lose as much money if more people do it and Redknapp does happen to leave.