The upcoming fight which I am designing takes place in the sewers, with many twists and bends. 13th Age does not use a battle grid or count squares per se, but keep track of the distance combatants using 3 abstract ranges - engaged, nearby and faraway.
What I wish to accomplish is something of a 'cat and mouse' chase, as the party try to run away from a big bad monster, they run into smaller ones along the way. What will happen is as the party runs, they will lose sight of enemies, due to the twist and bends of the tunnels. How do I keep track of where those enemies are without letting the players know, so that I can surprise them?