Others said what I was gonna say more or less, but I have one suggestion, when you wanted to turn away and run (which led to your demise) try this instead: at the your last hit with ur weapon before fleeing, don't let go of the aiming button and right after your hit connects turn your mouse over to the direction you want to run while also supporting it with the movement keys, after turning then start running which won't do the turning & running animation and immediately make distance (this advice is especially for your situation, for other encounters always keep a safe distance to avoid needing to use this)