Fire rooster and carried away

You play carried away on fire rooster to a lane with shellery on front and an unbuffed, undamaged snow pea behind.

Expected result: Either the 1 damage trigger first, or the bonus attack. Whichever is correct I don't know.

Actual result: The two plants immediately took 1 damage. Shellry dies. Fire rooster's bonus attack via carried away hits the hero instead of the 1 HP snowpea.