Its all plot induced stupidity.
Anderson wanted a human-predator team-up and a Queen boss fight so he had included it no matter how. Not only it should be considered cheating because its a test to prove you are big boy that can handle things on your own, but did Scar seriously thought a girl with a spear would help him stab aliens to death? That's cute. At least with Dachande, Machiko had a gun and it was a survival situation. Scar just had to leave the pyramid, he killed an alien, got the marking and the plasma caster. You are a man Scar, now run for it dumbass.
Fighting a Queen wasn't part of the ritual, the 3 were there to fight human hosted drones, nothing more. The situation never got out of hand in any way. How many aliens were even alive at this point? Less than 10 and 1 angry Queen. There were hundreds of Predators up there. They can easily hold the Queen off and clean up the rest of the hive down there, they must have done the same in 1904, 1804... since there were no signs of previous hives in the pyramid despite the Queen laying eggs multiple times over the last thousands of years. So there was no reason to blow up the pyramid at all, if Scar had made it out alive he should be sent to keep Scarface company for all the crap he pulled.