They were abandoned by their parents at eight-weeks old and are being hand-fed small portions of fish twice a day and weighed to monitor their progress.
Born last December, the bear ignited a heated debate about hand-rearing after his mother rejected him and he was brought up and bottle-fed by Mr Doerflein.
The young Wales star fed replacement scrum-half Richie Rees and his sublime pass out of the back of the hand gave Halfpenny the space to race over behind the posts.
The Swans defence held off striker Keogh's rampaging run but the Irish international fed Peter Whittingham whose 25-yard left-footer just whistled past de Vries' left-hand post.