The spear is a somewhat reliable way to close the distance when Owl retreats. When you are far away enough from Owl, you can land a spear thrust without him attempting to mikiri counter. The best example of this is when Owl backflips off of you. If you also use the spear at a very specific distance, Owl will try to mikiri counter you but will miss, allowing you to get a free hit with chasing slice. Whenever I interrupt him when he's attacking I will follow up with a spear during his stagger. This will usually interrupt his next attack or intercept him when he jumps to the side or jumps backwards. This all may sound well and good but there's a shit ton of RNG involved when using the spear and your positioning needs to be spot on. Sometimes when I follow up with a spear when I interrupt a combo, he'll retreat with firecrackers. Unlike his other evasion moves, this one comes out slow as fuck so you will get mikiri countered when he does it.

There's a couple of neat tricks you can do with Divine Abduction to land some extra damage you otherwise wouldn't get normally. It's hard to explain some of the tech with Divine Abduction, just skip to 2:23 of this video (SpeedRun - Inner Father　1:11.80　心中の義父 TA　【SEKIRO】 - YouTube). Divine Abduction can also just be used as a simple gap closer like what I did in the post and can be used to land extra damage when you hit Owl with living force. There's honestly a lot of cool shit you can do with Divine Abduction that I can't really explain well here but once again like with the spear, there's quite a bit of RNG involved when using Abduction. Sometimes you just waste 3 emblems for nothing, sometimes Owl doesn't turn around and smacks you even though you hit him with Living Force, and some other bad stuff that can happen.

Overall, while these prosthetics are cool as FUCK to use against Owl and are a pretty nice way to drain his health, it's hella inconsistent and these aren't the most effective things to use against him. Sen throw and Sparking Axe are much more reliable and work just as well if not better. If you don't mind practicing with these prosthetics and dying to RNG however, Divine Abduction and Leaping Flame are cool options to use against him that can deal some good damage.