Random thoughts: technically while shadow-jumping your both in the prime and in the shadow-plane, in kind of liminal state. So technically the speed your travelling, if the prime loosely fits RL physics, would break the sound barrier... I think a woosh is preferable to...

Fox carefully sneaks into the Fort, tip-toeing past the guards. she lingers in the shadow around the outer walls before spotting an open window on the ground floor, "perfect" a sly grin crosses her face. *SONICBOOM!* "oh crap!".

ermmm yea...

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This is an epic problem for me as on my housemates crappy computer I see almost no shadows so I've been rarely HiPsing and I can't remember the last time I shadow-jumped >_>.

If NEED to I just look for light sources then go behind large objects that if my graphics were up would cast shadow >_<. I ironically the spell light can be the best for shadow dancers: Light source = shadows.

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yup, campfire + tent = shadows...rain + the fact that clouds block the sun = shadow. you don't need need the graphics way up but it helps.