• shield blocks bullets from the front
  It is not always an easy task, but make sure shoulders are squared to the target.

2. Limiting the impact and risks of your vulnerabilities:

• long & medium distance engagements

  Playing Blitz, we want to hipfire almost all the time!

  Hipfire has a penalty to accuracy, so we are at a severe disadvantage when engaging defenders from more than a few meters.
  So let’s make it clear: As Rainbow Six Siege Blitz we not going to win long-distance engagements reliably against equally skilled defenders.

  It would be best if you used ADS only to kill defenders in particular scenarios, such as defender running away from you, reloading after emptying clip, not being aware of your presence, paying attention to someone else.

  Otherwise, hipfire while closing the gap steadily.
  You also do not want to spam hipfire shots from a farther distance. Instead tap fire and do so preferably being crouched and still – this increases the accuracy of your shots!
  In case you have to ADS from a far distance, do your best to make your head a hard target to hit.

  Such can be achieved by not standing still, changing stance, and leaning positioning.

• flanks & crossfires

  Take into account the environment when deciding where to attack.
  In case defenders established crossfire on your position or have high possibility to surround you, retreat and choose another place of entry.

  We should always try to double the cover we have by combining the defense provided by the environment with our shield.

• explosives

  Shields lower damage dealt by explosives, such as impact grenades and nitro cells.
  Reduction in damage depends on how many body parts are hidden from explosive. You take the least amount of damage crouching while facing an explosion with your shield.

  In case you know (or assume) defender(s) having nitro cells, do not always push their location immediately.

  Instead, try to bait them into throwing C4 at you when you are in a position to back off and turn towards explosion without exposing in the process your side or back to the defender.

• elevation
  
  A shield does not move much vertically when you look up or down.
  As Blitz one of your biggest enemies will be situations where you have to climb the stairs as you exposure your head and shoulders to defenders situated above you.
  Try to avoid them at all cost. In case you have to go up the stairs, overcompensate vertically direction you are looking at to minimize the effect.
  Consequently, crouching has a similar effect of head and shoulders exposure to enemies, thus do not aim down while crouching.

So what do we want to do as Blitz? 

We want to close the gap between defender and Blitz as quickly as possible while loosing as little health as feasible, with least exposure to flanks or crossfires.

Now, how do we do that?

Closing the gap as Blitz is all about doing so quickly, decisively and making our limbs hard to shot.
Once you decide to push defender, do so deliberately by moving from cover to cover. 
Leaving cover to change mind in the process and then hang in the middle of the room or corridor without a plan is a bad idea when playing Blitz.

Advanced Blitz players use switching between stances (standing & crouching), as well as swapping leaning angle, to throw defender’s aim off and make it hard to hit weak spots.
Your legs are exposed when running with shield, while shoulders and right hand are at risk of being shot in a crouch position.
However, try not to spam the crouch button rapidly without a pause – defender will continue shooting our legs, and you won’t achieve anything with this technique.

When planting a breaching charge or bomb defuser, Blitz puts his shield on his back.
Shield blocks then bullets shot in his back, which can be used as additional protection when planting defuser.