To quickly break out of the Empire's Mecha, the Independent Group abandoned squad members whose Mecha had been damaged, letting them be swallowed up by Empire Mechas.
This might be related to the dwindling remaining energy of the Independent Group's Mech, they couldn't afford to be besieged anymore. If they wanted to rescue those members, they would inevitably suffer greater casualties, even leading to the destruction of their entire army.
But looking at their combat objectives, they are really wholeheartedly helping the Western War Zone.
The reason? It's not important.
They're all human beings after all.
"They broke out, they broke out."
"The Independent Group broke out."
When the excited cries suddenly rang out, the situation on the battlefield began to change continuously.