Escape Detection

• WOTC Official Reminder Textofficial rules
  Freerunning — Freerunning [cost] (You may cast this spell for its freerunning cost if you dealt combat damage to a player this turn with an Assassin or Commander.)

• WWizards of the Coast2024-07-05
  Official Ruling
  If the target creature is an illegal target as Escape Detection tries to resolve, it won’t resolve and none of its effects will happen. You won’t draw a card.
• WWizards of the Coast2024-07-05
  Official Ruling
  Once an Assassin creature or commander you control deals combat damage to a player in a turn, you can cast spells for their freerunning costs for the rest of that turn. It doesn’t matter what happens to that Assassin or commander after that.

Rulings via Scryfall