Heston Kjerstad hit a 12th-inning grand slam to give the Baltimore Orioles’ Triple A affiliate Norfolk Tides the 5-3 win over the Lehigh Valley Iron Pigs. Kjerstad hit the walk-off grand after htting another home run earlier in the week. He returned to Norfolk this week after spending three weeks with the Orioles. Kjerstad is one of the Orioles’ top prospects after being drafted by the team No. 2 overall in 2020. He made his MLB debut last year and recorded a .233 batting average with seven hits and two home runs in 13 games. This year, Kjerstad has played in seven games and tallied two hits i…