A bit of a side tangent—I wondered how the game would play if teams were penalized for killing the enemy Medic but not capping Mid. Currently, if you play a Midfight and only one Medic survives with mutual casualties, it is often advisable to back up to Second or Last in order to preserve Uber advantage and wait for respawning players.
Imagine if this dynamic was changed. If you kill the enemy team's Medic but decide to leave (fail to cap), the spawning Medic will build Uber at a slightly faster rate.
This mechanic triggers specifically when a team has a Medic Advantage (One Medic alive, one dead). If the team with the living Medic fails to cap, the penalty applies.
You kill the enemy Medic.
Your Medic survives.
You capture Mid.
Normal game play
enemy medic lives
your medic dies
you capture Mid
Upon respawn your medic builds uber at a faster rate
You kill the enemy Medic.
Your Medic survives.
You don't capture Mid.
Enemy Uber builds quicker than normal upon respawn.*
*This build rate change only occurs before Mid is captured for the first time. After this point, normal Uber rates are in effect.