Let's imagine BIP110 miners have 10% of the hashrate and in August there is a chain split (but no hard fork). BIP110 blocks come in much slower so it takes 10x more time for a difficulty period to pass. At the same time Bitcoin (with the current consensus rules) takes only 11% more time for its difficulty period.Eventually BIP110 will pass its first difficulty period and the difficulty will clearly go down from their perspective. All this time Bitcoin did save the separate branch of BIP110 blocks because the blocks were valid, but once the difficulty went down for the BIP110 chain would Bitcoin Core still accept the new lower-difficulty BIP110 blocks? Wouldn't Bitcoin Core reject those blocks effectively creating a hard fork?