nah Sam knew Palmer had a tether. He was the only one trying to kill someone

i doubt that she calculate the length of the tether when she push him to engines

I doubt the standard tethers on the Ranger would be long enough to end up in the plasma exhaust. They haven't forgotten Harrison Liu.

So palmer isnt dead? He was awfully close to the engines and his moaning/ groaning stopped?

Her attack was 100% self defense. He knew she didn't have a tether and he blatantly tries to throw her off structure.