How to Change to the Same Point in Another Animation

I'm making a platformer and I want the player to be able to point their gun diagonally up and down. I'm using sprite sheets since the game is in pixel art. So my question is this. If the run cycle is the same number of frames (in this case 7) how would I switch from say frame 4 in the straight ahead animation to the diagonal upward animation. I've already looked in the animatior script reference and there is so much information there that I couldn't sort through it all.