The Apex Legends Season 6 Update came with a fairly large amount of bugs and exploits, including some bugs surrounding Rampart and Knockdown Shields. The most recent exploit discovered by players has allowed Octane players to chain Stims to go way faster than usual. The bug is triggered by simultaneous use of the Stim ability and Holo-spray.
The bug is triggered when a player uses the Stim ability and a Holo-spray at the same time just as the previous Stim is about to run out. The timing is a little bit tricky but if done correctly, Octane will be able to chain Stims to go that much faster.
It's pretty hard to pull off but it makes Octane a difficult target to nail down when accomplished. He can still be taken out by a carefully aimed shot but with the increased mobility it is that much harder. Obviously though, it does have its drawbacks due to the health cost.
Although it does require some skill to use the exploit, it's likely that it will be targeted in the next patch to the game along with the bugs present in Knockdown Shields, glitched skins, and Sheila's ability to pierce shields.