Build Up Your Focus Shield
Mirror’s Edge Catalyst has a pretty cool mechanic called the Focus Shield. Next to Faith’s health bars, you’ll see a long white bar representing her Focus Shield. It protects Faith from taking damage, including damage dealt by ranged weapons. This bar will decrease as you take damage, and once it fully depletes, Faith’s health will start decreasing too.
A good tip to keep in mind is that you can easily build up the Focus Shield again, even in the middle of a fight. Faith will recharge a bit of her Focus Shield whenever she takes down an enemy, or by simply traversing the environment. This means that performing slides through obstacles, and jumping from one platform to another will also help to recharge the Shield. Whenever the Shield gets depleted, try running away from your foes to recharge it before heading back in.