Board Thread:DC's Legends of Tomorrow discussions/@comment-9346948-20160413000408/@comment-3423279-20160420014839

Eobard once again wasn't trying to mess up time, he even said he was very careful to keep events mostly the same.

Once again it isn't their job.. their job is to prevent people from messing with the timeline and Eobard didn't do that. Rip's reason to stop Vandal Savage only occured once his family was killed, he must've known that he existed beforehand yet did nothing.

Also.. why the hell were they in that era to begin with? Did Rip send them there or something?

Possibly, he is very fast and has no issue with killing those that impeed him from his goals.