When shot, one starts to cry "MEDIC!", I get revived. Then runs straight in to a heavy rain of .50. Yet again I has fallen by my enemys hand.
Then I tried to scream. And nothing was heard.
"When gunned down, no-one will hear you scream"(tm)
... Man I'm tired.
Bottom line: Can't scream MEDIC! after beeing shot down twice. Well you can. But only if you havent used all of your medic screams.