Enemy Territory, start of level.
Everyone spawns with half ammo.
"I need ammo!"
Field-op runs to get a good position from which to call artillery to stop the enemy tank.
"I need ammo!"
Field-op needs full mana to call that artillery, and cannot spare mana to hand out ammo to people who already have half ammo.
"I need ammo!"
Field-op can hand out ammo with remaining half mana once artillery is firing, but needs to retain full mana until in position to call artillery strike.
"I need ammo!"
Field-op gets into position to call artillery.
"I need ammo!"
Field-op looks through binoculars, sighting on the road in front of the enemy tank, waiting for the front end of it to come into view five seconds' drive from where the first shell will fall.
"I need ammo!"
Idiot shoves field-op off vantage point and down the steep, snow-covered slope to the road below, whence there is no view of the tank, the bridge, the road beyond the bridge, the enemy positions or, indeed, anything much.
Field-op calls artillery strike on idiot's helmet instead.