Altair: break-even uptime calculation

[yandhii]

Link: https://github.com/ethereum/annotated-spec/blob/master/altair/beacon-chain.md#aside-what-is-the-break-even-uptime
This section says that the online optimal reward is 50/64 * p + 14/64 * p**2, and the offline reward is -42/64 * B. So, if my offline probability is q, Shouldn't my rewards equal to B * [(50/64 * p + 14/64 * p**2) * (1-q) - 42/64 * q] not B * [(50/64 * p + 14/64 * p**2) * q - 42/64 * (1-q)]? This confuses me because I thought the logic here would be "best reward * online probability + offline reward * offline probability"?