You have no idea how to react to a controlled size increase like that, but you figure if it's not an issue to them, then nothing good can come from interfering with them. You settle for quietly watching them, and seeing how this affects their game.
Even before the goal, you would've assumed that the "skins" had an advantage over the "shirts." Lee looks much more in shape than most members of his team, with a fit body that allowed him to sprint lightly and quickly over the field with impressive control over the ball. All the other "skins" weren't as impressive in their physical development, but they were apparently close friends with Lee, because their synergy with him was amazing. A firm defense by the "shirts" prevented them from a score for the first seven minutes, but through a brilliant couple of passes by Lee and his friends, they managed to evade their blocks and outmaneuver the goalie twice. They whooped a cheer, met in the middle, and extended their hands again as they grew another foot, to a number of jealous stares by the "shirts".
After the first two goals, it started turning into a rout. The shirts are clearly losing steam against their more organized counterparts. Furthermore, in addition to a height increase, the growth seems to have given a renewed burst of energy to the "skins." The "shirts" try to keep pace with Lee as he passes back and forth with a partner, but soon he outpaces them and shoots for another goal, which the goalie desperately dives for and misses. 3-0, "skins" leading.
Again the "skins" congregate, and again, the "skins" extend their arms in the air after a team cheer. You could swear their muscles are growing bigger along with their height, but you aren't sure yet- their shorts ride up again, but despite getting a little tighter, they're not bursting like you'd expect them to. You glance at the "skins", now the size of full-grown adults or bigger, and compare them to their competition, all of them red-faced and bent over wheezing for air. This is going to be brutal.
It is indeed. The "shirts" have all but no energy or will left, and when they chase, they barely manage a saunter. They don't even gain hold of the ball for a second during the rest of the match, and every single one of them fuels the yells, chest bumps, and high-fives of the ever-growing spirit of the "skins." It's rather fascinating to watch two supposed ten-year-old kids jump from the ground, high-five each other in the air, and land again a foot taller than they were. The game continues.
"Torture," you think to yourself, actually might be a better word. Once the "skins" reach twelve feet, it becomes apparent they're not just beating the "shirts"- they're teasing them. Lee kicks to another teammate you heard called Ryan, but his foot is so large that it also sweeps his four-foot-something tall coverer and knocks him to the ground. Lee just sneers a brief laugh and runs on ahead. "Shirts" are being bodychecked, tripped, and kicked by legs now taller than they are.
You try to ignore it, but at 11-0, you know something had to stop before someone got seriously hurt. You blow your whistle and wave your arms to indicate a group meeting. The "skins" muscular development is obvious at their size, now. Even if they weren't all fifteen-foot tall behemoths, you could tell that their figures are nowhere near the boyish muscles they had at the beginning of the match. Firm, bulging calves stand out behind pulled-up socks underneath massive thighs, tightly covered by high-riding soccer shorts which you can help but notice also press against their... packages. You look up, transfixed, at the ten-year old "skins", gazing at toned abs, pecs, and triceps covered in sweat, as they pant heavily but smile broadly and expectantly, waiting for your words.
"Well, um..." You cough to clear your throat and calm your nerves. "First, I want to say congratulations on your skirmish victory, skins-"
You are immediately interrupted by a roar of approval from the skins overhead, followed by more chest bumps and clapping. You wait for it to end then continue.
"But I think it's safe to say that the skins have a definite advantage over the shirts at this point, so something needs to change to fair it up."
Followed by groans from the skins and claps and murmurs of consent by the shirts.
"Come on, coach, we got this height fair and square! Let the shrimps suffer!" Lee objects.
"Your team is the ENTIRE soccer team, I'll have you remember, Lee- if they suffer, then the team suffers. I was thinking-"
You never hear what you're thinking, because you're immediately interrupted- again- as an idea is mentioned and met with unanimous yells of approval from both sides.