AN 84-YEAR-OLD ex-university official savagely attacked by four young punks during a walk in Wissahickon Valley Park earlier this week theorizes that the beating he endured was a cruel game of "get the old geezer." Jim Shea, a former vice president of university relations for Temple, from 1968 to 1983, walks up to five miles on Forbidden Drive, in Fairmount Park, three times a week, but that type of stamina wasn't enough to stave off the lowlifes who not only beat him bloody, but dealt a blow to one of the things he holds most dear - his pride. Shea...