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1) Get an Esperia Prowler Utility and an ATLS/Geo/Ikti/Rad
2) Attach ATLS to grid by dropping it in the red zone (for loading and unloading only)
3) Close the cargo bay
4) Prone under the railing
5) Observe the 'enter' prompt on the ATLS
6) Prepare for titanfail

What happened
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Entering ATLS whilst attached to grid will cause it to detach instantly and rather than physics jiggle down, it physics janks UP into the roof of the prowler.

What should have happened
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Not that, not sure what exactly should happen other than not animating when on the prowler grid specifically, but certainly not the jack-in-the-box

Workaround
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GEO can jump away, non jumpy exosuit will need a tractor to pop it out