It seems to me that there are two possibilities, and either way, Hurd should win:
1. It is possible for Hurd to work for Oracle without disclosing HP trade secrets. Then Hurd is not breaching his agreement by working for them.
2. It is not possible for Hurd to work for Oracle without disclosing HP trade secrets. Then the agreement is a de-facto non-compete agreement, and therefore unenforceable.