When we say event A happened after event B, we usually forget spatiality of the occurrence of A and B. To have meaning in before and after both events should happen at same location. If it occurs in two locations we need to rely on an agent that moves from one location to other. In special relativity this agent is a light signal or set of photons.Even in special relativity it is vague, it don't use a single photon but Einstein used a set of photons and called the agent a light signal. There are lots of problems with this association for example quantum theory and uncertainty principal.
Simultaneous actions practically do not exist. Both actions should take place in the same location. Two actions cannot take place in the same point in space.If it happens, then it is one action.
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