Got killed by hyperline

[Binguss]

While being at 350hp I jumped onto a hyperline to go and heal.
At that moment I got shot from a mile away, therefore I got kicked down from the hyperline immediately dying from it.

 

[Khanzy]

This is an intended game mechanic. If you maintain zipline for a few seconds you become shielded and only slow down upon being shot. But that initial jump up is a risk you should weigh from now on.

 

[#1 Cool Veno Appreciator]

In addition to what Khanzy said, you can also juke attempts to knock you off the zipline by jumping up, immediately crouching to drop off (but maintain momentum), then hopping back on once you've broken line-of-sight to your pursuers.