Make a gap that shoots chen directly upwards into the air, then when gravity has slowed her down, make a portal below her to spit her out on the ground....or chen could just fly.

The hypervelocity pro-Chen-ctile.

Quick! Someone save her before she reaches terminyal velocity!

Speedy thing goes in, speedy thing comes out.

She needs those boots chell wears in portal.

Achievement unlocked: Terminal Velocity