Witches exist at the top echelons of society. These individuals summon the orgone within themselves to perform various feats of magic through invocations. One brand of magic revolves around battle. These attacks can be very powerful, and consist of magical attacks and defenses. Some are designed to focus on a particular opponent, such as fireballs and beams of energy. Others are geared toward an entire area, such as lightning storms or small tornadoes, which can kill dozens if not hundreds of people. Still others focus completely on defending the user, such as magically generated shields or protective spells. Battle magic is powerful, and can turn the tide in war. However, they have some limitations which can effect their success.

1. Invocations can last anywhere from 30 seconds to 5 minutes depending on the type and Power of the attack. They last for various durations. Some can be used repeatedly with the mage keeping the spell active by using a shorter version of the incantation (energy blasts, fireballs, etc). Others are one-shots, and the mage must start over from the beginning to use a second time.




2. Battle magic requires a certain amount of orgone from the witch. The cost is determined by the power or length of the spell. Orgone replenishes over time at different rates depending on the user.




3. Mages must be relatively close to the area they wish to target. They can be separated only by a few dozen feet in order to be in range, or the attack won't hit.

Basically, witches can be walking, fleshy tanks, and are very valuable to their societies. However, they can also be targets for assassination or sabotage by other rival covens or states. Therefore, they are often heavily protected by shield guards. The job of these guards is to keep their witch alive at all costs, and protect them while they are performing their invocations. They can range from one to several, depending on the importance and wealth of the witch.

It would be common sense for witches to use other witches to guard them, as one can focus on defense while the other on attacks. This would provide for an impenetrable combination. However, shield guards are always magic less. Instead, they use regular weapons to protect their wards.

Why would this be the case?

3 factors:

Range

Range of regular 9mm pistol: from 50 (effective) to 100 meters, according to Wikipedia. A rifle can do a few hundred meters for effective range, and kilometers for maximum range.

Range of a mage:

Mages must be relatively close to the area they wish to target. They can be separated only by a few dozen feet in order to be in range, or the attack won't hit.

I don't know how much "a few dozen feet" is for most people, but for example five dozen feet are a little less than 19 meters.

People in your world probably say things like "Don't bring spells to a gunfight".

Ammo

Ammo for guns is only ever spent when you fire the gun. The ammo for spells, though, is mana (called orgone in your world), which is spent when you cast. A mage may find theirself out of mana to cast a fireball because they had been repeatedly casting non-combat spells, such as Mine Manacoin or Naruto's spell Sexy no Jutsu.

Cost

Witches exist at the top echelons of society.

But regular bodyguards don't. I am quite sure the salary of a gun-bearing goon is orders of magnitude smaller than that of a witch.

It's like Jason Momoa and his bodyguards:

Sure, they are less muscle than Momoa himself in a fight. But I bet their salary is less than, say, Terry Crews's and The Rock's.

Body guards are supposed to cover the weak points of the target.

Invocations can last anywhere from 30 seconds to 5 minutes depending on the type and Power of the attack.

Mages must be relatively close to the area they wish to target. They can be separated only by a few dozen feet in order to be in range, or the attack won't hit.

Imagine how nice would it be that while the primary target is busy buzzing the main invocation, also the bodyguards start buzzing some other invocations. This would leave at least 5 seconds of vulnerability to a non magic attacker, or, even worse, would be totally useless against a ranged attack (an arrow takes less than 5 seconds to hit).

Therefore the bodyguards need to make a living testudo around their protegee, protecting the openings which are not well protected by magic.