ABC was able to tie CBS in the key age 18 to 49 demographic last night. with a “Grey’s Anatomy” episode that introduced characters from its “Station 19” spinoff, as well as a “Scandal” and “How to Get Away With Murder” crossover. However, the Les Moonves-led network still ran away with Thursday’s viewer crown. They took the cake in large part to “Big Bang Theory” and “Young Sheldon.” NBC finished in third place outright.