Given that:

1. According to the white and yellow paper a block's timestamp must be bigger then the parent's.
2. According to the white paper a block's timestamp can be within 2 hours of the parent blocktime.

Would that imply that if a differential block time of 1 h 59 min occours,

1. the next miner has to either fake a 1s block time,
2. or wait until his unix time catches up

Is this true? Is there a reason why empirically it never happened?