This is best done with mages but can be done with other classes. What your going to do is need to get a slow fall cast on you. So just ask for slow fall in the beginning if your not a mage if you are cast it on yourself.
1. So Get the Slow fall buff on you.
2. Before the match starts run to the back of that bubble and then when it goes away run and jump off the edge with your mount.
3. You will fly all the way to that bridge that the flag is on. Giving you enough time to grab it and and run to a base being capped.
**This only really works in the beginning but it still gets your team some extra points**