The Giants learned a lot about rookie Chris Heston when he was called up to fill Matt Cain's spot in the rotation and he responded with three starts of six innings or more while allowing one earned run or less. They may have learned even more about him seeing him face his first adversity of the season when he was touched up for six runs on 11 hits in 5 1/3 innings at Coors Field in Friday's 6-4 loss to the Rockies.