I reckon the siren like thunder : threat, distance, relation. The sound is high-pitched, continuous, and mechanical, and I do not recognize it at first. The siren does not warble; its pitch is constant. Suspended in traffic, the ambulance proceeds fitfully next to a Shiva temple and does not move fast enough for me to perceive the wave changes of the Doppler effect. Cars and rickshaws and motorcycles edge around the accident scene, which is less a full stop and more a diversion. The siren joins the sonic fold of Mumbai's traffic alongside horns offering "you go" or replying "my turn" as cars dance. From a distance, the road looks frozen. Up close things are stop and go as injury and repair churn. I reach my destination an hour later and never learn about that ambulance, but the siren stays with me. It broadcasts traffic's milieu, mobility's tectonics, and the challenges of moving injury in Mumbai.