For time-like separated events all observers will see the same order of events from any reference frame. So I will always be seen opening the refrigerator before I take something out of it. For space-like, I can be opening my refrigerator and my neighbor could be turning on their TV at the same time and these events are space-like separated and one event can never be the cause of the other. So a third observer can see these events in either order.
Let's say you have event A which is JFK assassination. Event B is a Secret Service Agent back in Washington watching his kids baseball game. Here's the question. Could a 3rd observer see the Secret Service Agent watching the game, warn the Secret Service Agent that J.F.K. will be shot, the SSA calls and warns other SSA and in the 3rd observers worldline Kennedy wasn't assassinated. So can space-like separated events ever become time-like?