Can somebody please assist me perceive these combats in Final Z Survival Shooter?

I’ve 5 heroes at degree 69 or increased, and I nonetheless can’t defeat these different ones which are solely degree 30+. I see that it says “Restricted” on the high after I select my heroes, however even when I take advantage of heroes from the opposite factions, which I even have at increased ranges (over 50) I nonetheless can’t beat them. I’ve been caught right here for a few week. Might somebody clarify why this occurs? How can I defeat them? And the way do the factions really work?

I additionally wish to know why it reveals that assault energy right here, however in different modes the place troops are added, it goes over 500k. Might somebody please information me and inform me what I’m doing mistaken? I might actually admire it.