Killing an enemy during your turn seems to softlock the game

[ThePhantomStranger]

Repro steps:

Start game
Progress towards the first enemy
Kill him on your turn
Observe that characters can no longer move or perform actions

Actual behavior:

Game is softlocked. Music transitions out of battle music, character animation continues, but no further action except returning to menu can be taken.

Expected behavior:

The game continues as normal, allowing the next player to move or perform actions.

[SilasReinagel]

Duplicate of #610