Yes soa stops a dual, triple or quadruple abilty, as it stops abilities. Unless ofcours the card would have protection:ability / power +2 or something like that as an ability.
You have some troubles making valid arguments and just seem to troll, we arent even discussing if Fixit is OP or not, we are just stating that double abilities will come to pass and that Fixit is the foot in the door for that.
But that's not a dual ability, cuz both "abilities" are just one protection for 2 stats, and if you use SoA it stops the protection. And it's not nearly like SoAB, it doesn't even block abilities, it just keeps the stats from being changed. It's not gonna stop any bonus or any ability whatsoever. Protection works diferently than other abilities, there WON'T be any soa/backlash, I'm 100% sure of it, it wouldn't even fit on the card.
Serena, Selina and Chiara, you say?
Serena's ability is no match to Hawk's, it only keeps her power but remains weak to damage reduction, +power, and her damage is still low for a 5* card in Ulu Watu (too low damage clan). Hawk's ability on the other side stops any kind of damage reduction, + or - power and can even be used defensively. And he's got attack manipulation, which means he can be used to bluff. And his clan got such awesome 2* (Lehane and Tobbie) he can be easily placed in any deck. With Melvin it's a really good 12* half.
Selina is... I don't get the hype about this card, it's nothing really special. Her ability is worse than Tsubame's or Shaakarti's bonus and it's an offensive ability (at least on a 5*, you don't want your 5* to lose), so I'd say she's only good for survivor T2.
Chiara is a nice card in a nice clan. If you need a 3* filler she's good cuz her bonus is the worst bonus and logically she doesnt need it. But with bonus, Nanook, Olga, Robb Cr and Mona still work better.
Lehane is the best 2* wall ever, nuff said.