^Too loose, very vague. Not to mention there is a reason why they get hit, and most people familiar with the glitch know this. Hence, in a very pedantic way, people who know the glitch, can perform it. Its good to see there's some effort to get a reword here.
Actually, looking back at Umbreon's rule, a little re-wording from that and you can get into:
"Both teams must remain in starting position until control is gained".
Sounds right, and solid. Any comments?