Intentional or not, it's not the bowler's job to ensure that the batter gets to 100.
If people blame anyone for Vince not getting a well deserved hundred they should be looking at his batting partner.
To me, in between balls it looked like Vince was indicating to hughes that the hundred wasn't important. With Vince on 98 and the team needing 5, Hughes smashed a 4, and then proceeded to block the next 3. bit of a sudden change of plan.