What happens to particles trapped in two event horizons?

Let's say two blackholes get close enough to each other that their event horizons overlap but not enough that the singularities at the center fall into each others event horizons. A particle could find itself inside both event horizons at the same time without the blackholes merging. If the blackholes move with respect to each other to the point their event horizons stop overlapping, a particle would have effectively entered and then escaped at least one of the event horizons or something else happens?