i find when side drilling i have the shoulders about 60degrees
but the hips about 45deg ie highside hip cocked down

so a twist in the body

this allows water to come in with minimal resistance profile from shoulders

and then "slip out" from under the highside hip

i find you only need to rotate hips to get the "wing" (iliac creast) out of the way and let the water slip out from under it

if i lock hips to shoulders im unbalanced