The title means "pursuit".
A picture shows the Sumerian 'palace of Gilgamesh, 2700 B.C.' That photo is actually of the rebuilt facade of the 'Great Ziggurat of Ur' located in Iraq. First built around 2100 B.C., the temple crumbled into rubble and was rebuilt around 600 B.C. and then lost untill excavated in the 1920s and 30s. The heavily eroded Ziggurat was given a new facade the 1980s.
When Sara learns that Vorschlag Industries was involved with the Black Dragon program, she zones out over her fight with Irons. Danny notices and suggests it is a fugue state. The writers got this confused. Sara experienced a dissociative state, which just means she was not grounded in the here and now; immersive memories, daydreams, zoning out while driving are all dissociative events. If you have partial or total amnesia that dissociates you from your normal identity, if you wake up in a strange place not knowing who you are or thinking you are someone else (when there is no medical cause like a head trauma), that is a dissociative fugue.
While viewing the crime video, Jake says, "...they used jacketed ordinance. No one really does these days, except us and soldiers." Four years before this episode was filmed, NYPD discontinued using jacketed 9mm ammo and switched to hollow point. At the time the switch was announced NYPD had just spent $500,000 on jacketed ammo.
'Jacketed ammunition' means the lead bullet is covered in a layer of some metal harder than lead, usually brass or steel. These bullets do not flatten out when they hit a body and subsequently tend to go right through a body, doing minimal damage. In 1907 the USA signed on to the Hague Conventions which made it illegal for waring armies use ammo designed to kill, instead ammo must be designed to injure. Police and Federal agencies however use bare lead hollow point ammo designed to flatten out and maximize the killing power of the bullet. Army ammo is designed to injure not kill. Police ammo is designed to kill not injure.