I have a mnk/war crab +mnk traits (never ran him without traits) and he guards, counters, and attacks with both his nubs. this crab was origanelly PLD/. I havent tried yet running mnk pet without traits, but in PC martial arts just increase the attack speed of H2H (i dont have mnk leveled so i may be wrong), as it does with mnk traits in pankration. So in theory if the pet is mnk/ whether it has martial arts or not it should still attack with two fists. like i said in a previouse post i'll test it when i get home tonight.