Is Swift Account Pull Teemo from Battlefield from Battlefield reaction speed?
The ability on the Swift Scout legend card is an activated ability.
According to the game's rules for activated abilities, they can primarily be activated only on the controlling player's turn and during an Open State. Because an Open State requires that no chain exists, this ability cannot be activated at "reaction speed" (i.e., during a Closed State or in response to other effects).
To summarize:
- Timing: As an activated ability, it must be activated during an Open State on your turn.
- Chain: When activated, it is placed on the chain and can be responded to by other players, but it cannot be used to respond to other game actions itself.
Note: I could not fully verify this ruling against the retrieved rules.