Save scumming is when you use the save sytem to progress. Basicly, you keep reload and do the same action until you have luck in your favor.
I do not know the context of your trial but grenadier can be instant kill by Sid and Gabe. It is not clear, but when they go “berserker” after you dealt damage to them, you can go on contact without be interrupt.
Some pleople beat the game on Insane + Ironman (no reload, game over erase your save). I am pretty sure that at least 90% of game over are due to bad decision. My own trial is full of them. but more I have experience, more I noticed that the case I though the game was unfair was case were I was in fact not good enough.
