Given that:
 

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

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][3]?


  [1]: https://ethereum.stackexchange.com/questions/5915/can-a-child-block-have-an-earlier-timestamp-than-the-parent-block
  [2]: http://ethereum.stackexchange.com/a/5926/264
  [3]: https://ethereum.stackexchange.com/questions/5879/what-is-the-measured-distribution-of-block-times-since-homestead