I think this is what happens next: the Horde troopers spot Adora and Bo and attack them; they split up to avoid being captured, giving Adora the oportunity she needs to change into She-Ra. After She-Ra defeats the Horde troopers, Bo asks her where Adora is and she tells him that Adora is safe.
When I was a kid I was watching He-Man & She-Ra movie like a proper, four-year-old(approximately) fan- In my pants holding a plastic sword. It wasn't always hot enough for such cosplay, so I had to go to bathroom pretty often and it got me wonder- "When does He-Man go to bathroom?". Pretty quickly I realised how simple the answer was- when they cut to other characters far away from him and he's off screen. Aaaah, life was so simple.