The chaos of battle can always be confusing. Delia's fallen behind due to drones, terrian, and all sorts of issues on her end. So right now? She's playing a little bit of catch up. Her bike engine's probably heard first as she's coming up behind Natasha, rifle slung back on her back as she's been focusing on driving through the snow and snowdrifts.

Slowing down some she comes up alongside the assassin, "Need a lift? Playing catch up here too!"