Opening in T20 cricket is a simple role - utilize the powerplay restrictions to score the maximum amount of runs possible. It isn't that easy since the new ball moves but the mindset of openers should always be to use that movement to the benefit.
Generally, teams begin slow and cash on in the subsequent overs, especially the slog overs. However, Delhi Capitals this year have attempted to maximize the powerplay by deploying Prithvi Shaw and David Warner to smack the new ball.
Shaw and Warner opening the inning was always going to be an interesting pair to watch as both like to take on early in the inning. Generally, only one of the partners goes for the kill while the other drops anchor. In the case of Shaw and Warner, both go for the kill.