Episode 311, "Severed Ties"
SEASON 2, EPISODE 213 - When a young gang member is shot - his older brother, who had left gang life, sneaks him into the hospital where he works to try to patch him up. The rival gangbangers follow the siblings to the hospital, where a shoot-out ensues. SRU is called into diffuse the situation. They stealthily take over the hospital, and rescue the young shooting victim. Ironically, convinced he had to take out the rival gang members to protect his sibling, the reformed older brother, is taken out by Team One.