Weird Tower Climb Damage Floor

related video: https://www.youtube.com/watch?v=jAjGHS54Y0Y
tweeter hypothesis by danny: https://twitter.com/dannyb21892/status/931014385908281344
Tested all speeds in the range (y-vel, lateral speed) \in [-20,0] x [-18,9] with a spacing of .25 in each component.  This is a pretty good sample of all obtainable speeds, the ones listed are the ones that caused the quarter heart of damage.

y-vel		lateral speed
-13.25		-18
-13.25		-15.5
-13.25		-13
-13.25		-10.5
-13.25		-8
-13.25		-5.5
-13.25		-3
-13.25		-0.5
-13.25		2
-13.25		4.5
-13.25		7
-13.5		-17.75
-13.5		-15.25
-13.5		-12.75
-13.5		-10.25
-13.5		-7.75
-13.5		-5.25
-13.5		-2.75
-13.5		-0.25
-13.5		2.25
-13.5		4.75
-13.5		7.25
-13.75		-17.5
-13.75		-15
-13.75		-12.5
-13.75		-10
-13.75		-7.5
-13.75		-5
-13.75		-2.5
-13.75		0
-13.75		2.5
-13.75		5
-13.75		7.5
-14		 	-17.25
-14			-14.75
-14			-12.25
-14			-9.75
-14			-7.25
-14			-4.75
-14			-2.25
-14			0.25
-14			2.75
-14			5.25
-14			7.75
-14.25		-17
-14.25		-14.5
-14.25		-12
-14.25		-9.5
-14.25		-7
-14.25		-4.5
-14.25		-2
-14.25		0.5
-14.25		3
-14.25		5.5
-14.25		8
-14.5		-16.75
-14.5		-14.25
-14.5		-11.75
-14.5		-9.25
-14.5		-6.75
-14.5		-4.25
-14.5		-1.75
-14.5		0.75
-14.5		3.25
-14.5		5.75
-14.5		8.25
-14.75		-16.5
-14.75		-14
-14.75		-11.5
-14.75		-9
-14.75		-6.5
-14.75		-4
-14.75		-1.5
-14.75		1
-14.75		3.5
-14.75		6
-14.75		8.5
-15			-16.25
-15			-13.75
-15			-11.25
-15			-8.75
-15			-6.25
-15			-3.75
-15			-1.25
-15			1.25
-15			3.75
-15			6.25
-15			8.75
-15.25		-16
-15.25		-13.5
-15.25		-11
-15.25		-8.5
-15.25		-6
-15.25		-3.5
-15.25		-1
-15.25		1.5
-15.25		4
-15.25		6.5
-15.25		9
-15.5		-15.75
-15.5		-13.25
-15.5		-10.75
-15.5		-8.25
-15.5		-5.75
-15.5		-3.25
-15.5		-0.75
-15.5		1.75
-15.5		4.25
-15.5		6.75
-15.75		-18
-15.75		-15.5
-15.75		-13
-15.75		-10.5
-15.75		-8
-15.75		-5.5
-15.75		-3
-15.75		-0.5
-15.75		2
-15.75		4.5
-15.75		7
-16			-17.75
-16			-15.25
-16			-12.75
-16			-10.25
-16			-7.75
-16			-5.25
-16			-2.75
-16			-0.25
-16			2.25
-16			4.75
-16			7.25
-16.25		-17.5
-16.25		-15
-16.25		-12.5
-16.25		-10
-16.25		-7.5
-16.25		-5
-16.25		-2.5
-16.25		0
-16.25		2.5
-16.25		5
-16.25		7.5
-16.5		-17.25
-16.5		-14.75
-16.5		-12.25
-16.5		-9.75
-16.5		-7.25
-16.5		-4.75
-16.5		-2.25
-16.5		0.25
-16.5		2.75
-16.5		5.25
-16.5		7.75
-16.75		-17
-16.75		-14.5
-16.75		-12
-16.75		-9.5
-16.75		-7
-16.75		-4.5
-16.75		-2
-16.75		0.5
-16.75		3
-16.75		5.5
-16.75		8
-17			-16.75
-17			-14.25
-17			-11.75
-17			-9.25
-17			-6.75
-17			-4.25
-17			-1.75
-17			0.75
-17			3.25
-17			5.75
-17			8.25
-17.25		-16.5
-17.25		-14
-17.25		-11.5
-17.25		-9
-17.25		-6.5
-17.25		-4
-17.25		-1.5
-17.25		1
-17.25		3.5
-17.25		6
-17.25		8.5
-17.5		-16.25
-17.5		-13.75
-17.5		-11.25
-17.5		-8.75
-17.5		-6.25
-17.5		-3.75
-17.5		-1.25
-17.5		1.25
-17.5		3.75
-17.5		6.25
-17.5		8.75
-17.75		-16
-17.75		-13.5
-17.75		-11
-17.75		-8.5
-17.75		-6
-17.75		-3.5
-17.75		-1
-17.75		1.5
-17.75		4
-17.75		6.5
-17.75		9
-18			-15.75
-18			-13.25
-18			-10.75
-18			-8.25
-18			-5.75
-18			-3.25
-18			-0.75
-18			1.75
-18			4.25
-18			6.75
-18.25		-18
-18.25		-15.5
-18.25		-13
-18.25		-10.5
-18.25		-8
-18.25		-5.5
-18.25		-3
-18.25		-0.5
-18.25		2
-18.25		4.5
-18.25		7
-18.5		-17.75
-18.5		-15.25
-18.5		-12.75
-18.5		-10.25
-18.5		-7.75
-18.5		-5.25
-18.5		-2.75
-18.5		-0.25
-18.5		2.25
-18.5		4.75
-18.5		7.25
-18.75		-17.5
-18.75		-15
-18.75		-12.5
-18.75		-10
-18.75		-7.5
-18.75		-5
-18.75		-2.5
-18.75		0
-18.75		2.5
-18.75		5
-18.75		7.5
-19			-17.25
-19			-14.75
-19			-12.25
-19			-9.75
-19			-7.25
-19			-4.75
-19			-2.25
-19			0.25
-19			2.75
-19			5.25
-19			7.75
-19.25		-17
-19.25		-14.5
-19.25		-12
-19.25		-9.5
-19.25		-7
-19.25		-4.5
-19.25		-2
-19.25		0.5
-19.25		3
-19.25		5.5
-19.25		8
-19.5		-16.75
-19.5		-14.25
-19.5		-11.75
-19.5		-9.25
-19.5		-6.75
-19.5		-4.25
-19.5		-1.75
-19.5		0.75
-19.5		3.25
-19.5		5.75
-19.5		8.25
-19.75		-16.5
-19.75		-14
-19.75		-11.5
-19.75		-9
-19.75		-6.5
-19.75		-4
-19.75		-1.5
-19.75		1
-19.75		3.5
-19.75		6
-19.75		8.5
-20			-16.25
-20			-13.75
-20			-11.25
-20			-8.75
-20			-6.25
-20			-3.75
-20			-1.25
-20			1.25
-20			3.75
-20			6.25
-20			8.75