But neither is co-presence simply coexistence. For two entities to be said to be coexistent, it is enough that they exist at the same time, simultaneously. But co-presence assumes more than that, namely the possibility for one term to affect the other or to be affected by it (a relation of causality). In other words, co-presence is defined by an instantaneous but not necessarily actualized possibility of a real relationship. Yet another way of putting this is to say that co-presence is defined by the accessibility of one term to the other. To be co-present they must be within reach of each other. Two armies are in the presence of each other when they are within range, and that is the case even when not a shot has been fired. It is this notion of range that distinguishes co-presence, as a pragmatic concept, from mere co-existence.

Grégoire Chamayou, A Theory of the Drone, loc. 948