Avengers: Age Of Ultron - 25 Moments From The New Trailer You Need To See

19. Scarlet Witch/Ultron Show Their Power

Iron Man takes a powerful blast in this scene which knocks him clean through a metal door. The energy which forces him through the door is red - which is later shown to be the colour of Ultron's energy blasts - but it is already known that Scarlet Witch's energy is also red and the way the trailer is laid out seemed to suggest it was her doing (but that could be misleading).