"Want a hand, Bats?" Supergirl asks flying in front of you, in one of her hands she holds the net rope with which you caught the pair of criminals you were chasing. The fall at that height would break several bones at best, so they are as immobile as possible.

Kara rarely visited you in Gotham City, but she saw on the news that there was a breakout in Arkham, and when you didn't answer her calls, she got worried and flew to Gotham as fast as she could.