teamwork.tf bot on Twitter: "[Steam art] When your soldier activates his buff banner but you're the only one left in his squad https://t.co/xHzfa1mkqM #TF2 https://t.co/j2LwvQp3YL" / Twitter
Buff Banner - Official TF2 Wiki | Official Team Fortress Wiki
tf2 medic - How can I tell what glowy-ring buffs the enemy team currently has? - Arqade