Craig Brown headed by to Aberdeen "mystified" at how his side's Scottish Cup campaign ended at Easter Road. The home side's Gary Deegan scored a gem of a goal which booked a quarter-final date with Kilmarnock for Hibs. Despite an onslaught towards the end of the game Aberdeen will wonder how they failed to score. They need only look at Ben Williams who pulled off save after save, none more impressive than the one which kept out Scott Vernon's penalty. Brown said: "I'm quite mystified as to why we're not still in the cup. The team played with enthusiasm and fought to the bitter end. We didn't deserve to lose the game but we're not scoring. You can't get better chances than a penalty kick. I don't think Scott Vernon has missed a penalty kick before." His Hibs counterpart Pat Fenlon was understandably full of praise for Williams after his performance helped take Hibs into the quarter-finals. Williams saved Vernon's spot-kick seven minutes from time as Hibs made it to the last eight of the competition. The Hibs stopper has been beaten only once from eight penalties this season and Fenlon believes that is down to confidence. Fenlon said: "He has been fantastic all season. His penalty saves have been fantastic but his general all-round game is great. I think until we scored there was very little in the game. Once we scored it changed it a bit, but as normal we stood up well." Hibs now head to Kilmarnock and a third successive tie against SPL teams after seeing off the Dons and Hearts. But Fenlon refused to discuss Hibs chances of ending their 111-year wait to win the Scottish Cup. He added: "I'm not getting into that. Since I've been here that's all I hear. There's a long way to go and we've got a really tricky tie away from home next."