Seemed to take an age (approx 15 seconds) for the reversers to Deploy....saw the little crack/movement, which would be consistent with the WOW sensor..and pulling them back against the interlock.....but they then should have deployed in less than half the time we saw.
Have had a few ocasions where I pulled a little too hard and the reverser arm doesnt move squarely...so you have to restow..and try again.
A quick scan on youtube...and look at how much more quickly the reverser deploys here
757 reverser 3 to 4 seconds by my count
Or here
757 reverser 2 only a couple of seconds