Step-by-step: Jerk your characters around dramatically
This astronaut is being yanked straight up off the ground by a tentacle around his waist. He’s bent double, and his legs are straight. His arms are hanging down and splayed out a bit, so that his arms and legs become “arrows” highlighting the direction in which he’s being pulled. The lost weapon enhances the feeling of upward movement.
The alien’s grip on this astronaut’s upper arm is pulling him back. He becomes off-balance, and throws the other arm outwards to try to regain it. The right forearm is jerked upwards, spoiling any controlled shot. The left leg scissors up as the figure falls back, and the head is tilted slightly forward in a bit of whiplash effect.
One poor chap is being hoisted upside down by the left ankle. The arms hang almost straight down (reaching for the ground can enhance the feel of the pose) and the right leg is folding down with gravity as well, causing the body to arc back. Again, a lost weapon emphasises the idea of being lifted sharply and suddenly.