The Speed Force also has enforcers called to punish those who abuse time travel in order to prevent any further disruption of the timeline.
By accepting tragedy and moving on instead of letting it define him, the Speed Force allowed him to become a speedster again with the shadow appearing before Barry so that he could catch it.
In 2019, after Barry was infected by when he saved , the Speed Force appeared to Barry as Nora Allen and explained that Ramsey's infection was gradually taking control of Barry, and because the infection was sentient, allowed for Ramsey to be planted in Barry's mind.
Most prominently, they are able to drain a target's life force through physical contact and age them to death.
When trying to travel back in time to prevent the murder of his mother, , Barry Allen was able to physically see the Speed Force after passing Mach 2, viewing events from his past, present and future all at once.
The Speed Force then disappeared alongside Deon, leaving Barry distraught.