The danger arrow is nice, but I didn't know the hitbox would be that wide. Giving a player an indicator how large the danger will be should be fine.
Perhaps making the players doing some puzzle like pushing box to make bridge, or button to open the door to make pheromone would be nice.
Maybe player need to go to the solution, they need to toggle a switch. Which would cause the return path to be blocked so players have to toggle the switch again to return