The proposed dynamic timelock assumes that, as enough users, who aren't satisfied with a proposed change, deposit their stETH (or wrapped stETH and withdrawal of NFTs) into a designated escrow contract for withdrawal, the timelock duration begins to increase — this is called crossing the “first seal” (set at 1% of total Lido ETH staked).
If discontent continues and deposits cross the “second seal” threshold (10% of Lido’s ETH TVL), a "rage quit" is triggered: execution of the DAO’s decision is completely blocked until all protesting stakers have had the chance to withdraw their ETH