How does adrenaline interact with fat deposits?

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First off, I understand that weight loss is calories in and calories out. If you eat less calories than you burn, your body will burn fat. I get that and I understand that.

Now, I know that some people take stimulants like phentermine to loss weight. Obviously this works with any drug that mimics adrenaline, but thats beyond the point. I'm just curious if someone can explain how one of the ways it is supposed to work actually works.

Stimulants make you less hunger, activation of the sympathetic nervous system naturally reduces hunger. I got that.

Stimulants also increase your metabolism by raising your blood pressure, increasing your heart rate and raise your body temperature. Got that makes total sense.

Yet I always see this also mentioned "Adrenaline encourages your body to break down fat cells for energy". Not as a side effect of lower hunger or increase metabolism, but on it's own.

I've been trying to understand this but I can find anything concrete on exactly how this works. Surely it won't do this if you are already at a deficit. The metabolic increase and hunger restrictions will already put your in a deficit. Won't your body always just break down enough fat to cover your caloric deficit or do stimulants actually break down a little more than it needs? If so, is this effect limited by caloric deficit or not? If you do a line of coke, will your body still break down some fat even if you're glycogen stores are full and you're not in a deficit? How significant is this effect?