For a bigoted head mean girl at the start of the show, Aaryn sure is spineless. "I am scared of Amanda"? After she humiliated her in front of the house and made her cry, on the cusp of putting up someone, she still obeys her.
Having said that, Amanda is so stupid... her complacency was a disgusting sight to behold. Who the hell stirs up a petty overblown argument with the HoH right before she is about to make a third nomination. Or maybe it just shows how horrible this house is, that someone can be so arrogant and put themselves in such a vulnerable position and get away with it.
As for Aaryn, What's the point in staying safe just for now when she's going to gun for your blonde ass sooner or later, considering she's the weakest link in their alliance, when they don't need her they will dispose of her. This was the chance to make a big move, goddamnit!
All she had to do was convince Spencer (not too hard considering his his issues with Amanda in the past, telling him to throw the Veto comp etc) he would have obliged. Bimbo GM would just listen to her friend and play fetch. Elissa would obviously vote in favour of keeping Helen. DONE. Send the bitch packing. Weasels McCrae and Andy would have ended up looking like rats about to board a sinking ship, it would have been glorious to see smugness removed from McCrae's face and Andy's constant-state-of-panic face would remain the same, and the game would become interesting again. Alas it did not happen.
They should have made two jury members come back so this twist stands a better chance of being effective. One person coming back, will just be redirected back out again with this fucking paddock of sheeps.