I'm not sure how they could prevent that. Even if they add hps loss to a forfeit you could go in with the sprite darter hatchling or some other pet with life exchange and 2 random other pets you don't care about. Or you could have the sprite darter hatchling already low health.
Only thing I could think of would be to automatically heal all pets to full at the start and making forfeiting kill all the pets completely but that seems pretty harsh.
Alfonzzo wrote:you don't appear to lose pet health when you forfeit
You dont need it for any tournament battle. When I did Tournament this week on ptr, I lost: - 1 pet in battle against Kirym; - 1 pet in battle against Wise Mary; - 2 pets in battle against Bringtron 4000; - 1 pet in battle against Zao; - 1 pet in battle against Yu'la; - 1 pet in battle against Chi-Chi; - 2 pets in battle against Xu'en. All fights took like 15 mins, with no chance to lose.
To be fair, the PTR gives you a small and random assortment of pets, so often you won't have the particular pet you want to test. So I wouldn't expect anyone to have the perfect list of 27 pets to use until after it's live. Also, the non-Celestial tamers (the first 3) rotate among 3 possibilities, so 12 of your perfect 27 will also vary week to week.
For the Celestials, it's pretty clear that mech damage and avoidance will be valuable for the two beasts; Darkmoon Zeppelin is an absolute allstar and he's also good for a couple of the non-Celestial tamers (and lil Oondasta too). Peddlefeet/Gregarious Grell look to be very good for Yu'lon; some combination of Lil Tarecgosa/Nexus Whelpling/Azure Whelpling/Mini Mindslayer looks very good for Chi'ji. As it is on PTR currently, Water Spirit+Chrominius still works to KO almost any random legendary pet. But it doesn't look like these will be the only way to win by any means -- ie you won't really need the absolute top 15 pets, there's lots of pets that will get the job done.
Similarly for the non-Celestial tamers, there's a handful of pets that look really promising (but not required): flyers with UD attacks for the Monk tamer (and pretty good against Nairn too); there's a few Mechs with multi-hit attacks, so a pet with a shield and elemental attacks would be valuable (shale hatchlings, living sandling); Qiraji Guardling is going to be a superstar against the one Cleansing Rain/Dreadful Breath pet; Legs is likely going to be amazing against the elemental that does all aquatic damage; etc.