It's a foul Grace, regardless if its a beer league or just flight 3 11 years olds. I had one of the top refs look at and he said 100% foul and maybe even a yellow. This video was played at a ref clinic to teach dads that ref the great game to make these calls so fair and safe play can be #1 for all futbol players. Safety first!
You know as well as I do that there are these two competing interests in the game: one that the game should be interrupted as little as possible to keep the continuous flow (hence the trifling guidance) and two that the game must be managed to keep the game professional and safe for all involved. So while I agree safety is a concern, safety is not the only concern (otherwise we would not allow dangerous 50/50 challenges and instead give rights of way to challenging players such as say for example on a challenge the goalkeeper must always prevail). Just because something is a foul doesn't mean that it should be called, and indeed if this were to happen in the world cup, everyone would be screaming Neymar and for the referee's head. The referee must take into account the skill level of the participants as well as their age and body development. Where referees too often go wrong are between let em play and whistling for everything...a balance is needed given the circumstances which is what makes it so difficult...it can be tough to adjust given varying circumstances on the ground. Cards are also primarily a tool of game management to assist the referee in keeping control of the game. Hence, at this age group for the video presented, foul, no card. Hence also the discrepancies between referees on their outcome of the cast issue (put me down for a hella no...I think some referees are worried that the player's parents will complain to tournament/league organizers and they'll be in for a hassel, hence the no calls).