>>531203238
this is one of the few fundamental techs (i.e. one of the ones that are easy and incredibly practical) you should know for wesker, rebound tech
when you dash into an object you will slide along it. i think you have to hold strafe in the direction you want to go to maximize the amount you drift. don't quote me on that though. angle of your dash and the surface matters too. different objects give you differing amounts of slideage, that bookcase is like the maximum amount.
but generally it's as simple as dashing at the wall to whip around the corner

there's a couple mini variations of this too, where you use your first dash to go a very short distance, bumping right away, but then using the impulse of the bump to get around the corner faster and then immediately sending your long dash. this is good at shack, where if you were to dash twice normally they could make it around the corner or have time to dodge. i'll mspaint in a second to explain it a bit better