Near the hook, can Flashbang+Body-Blocking guarantee a save?

I like DBD, but nearly every session there's a new thing that seems broken and imbalanced. I was playing Daily Ritual tier up/break pallet, gen for Tome Myers and a (I'm guessing) 3-man SWF brought Blastmine and Flashbang. After the gens were done (there was a map offering for Ormond), I downed a Feng while she was unhooking and I was in Tier 3. I know the Dwight was around the hook.

I did a 180 before picking her up then pivoted toward the hook. I didn't see a "Hook Survivor" prompt; probably the Dwight was body-blocking. Two seconds passed without being able to do anything and then the Flashbang saved her. Is this a "tech"? Is it guaranteed to lead to a save?

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