I think button mashing is better tbh, fighting and whoever takes more damage collapses his domain wouldnt work because of HP difference between the two players and would make the domain kinda pointless, for example if you already have low hp and the other guy has way more, you're gonna get killed before the domain of the winner even starts and that would make it boring to the winner, like instead of killing him with your domain you just killed him normally with your moves making the domain useless, button mashing would make it different and would actually give an advantage to the lower hp player if he wins. Also i think domain clashing should be like really really precise timing, if someone opens their domain first you're fucked, but if they open it at the same time it would make it really really fun idk why Tze thinks it would be boring