Yeah that is a problem but if your team sucks a failed flag run is the least of your worries. Well from a past game I played today I random the skills shock wave, magic defense, endurance, sprint, demon storm on Prophet. So yea I farmed and if I was in position to make a run for their flag just before a duel I did. In that particular game I did make a flag run before each and every duel up until the time I was able to do bosses. In the duels I was holding the flag the only thing I did was cast tornado and let my teammates go to work. Long story short flag runs are well worth the trouble. You might try combining a flag run strategy with a long range ultimate like demon storm so your mobility won't even be an issue.