[StratoSpear]

Funny, after all these re-write attempts I actually found myself back to square one, my very first idea of initiating Minerva's intro in Athena:

Spoiler for Golem:

*BDBOOM*

“Tch…!”

Doing combat against a towering unmanned pitch-black Golem that has just blasted a huge crater on the grassy plains at the southern tip of the city where they’re currently fighting at, Inami who’s donned the powered full-body armor, Minerva, leaps over a boulder seeking cover while bits of charred earth and grass rain all around him. Through the mini-map displayed internally on the Minerva’s helmet’s hologram screen, he watches in horror as another blip similar to that of the Golem that he’s currently under attack from escapes his radar range towards Tokyo Bay where the prestigious Infinite Stratos Academy is located.

“So much for diversion, the other giant is resuming on its course towards the Academy!”

Out of desperation to give chase, Inami pops around the boulder pointing one of his arm particle guns at the Golem.

*brriiiriiriiriiriirii-rii-rii-rii-rii*

The hulking menace blocks the hyper-compact blue particle shots with its heavy-plated forearms but the shots still inflicts shallow red-hot blast marks as they chew away on its armor. The minuscule damages barely flinches the Golem as it curls its hand into a fist and points all four particle cannons around its wrist at the boulder Inami’s hiding behind. He boosts out of cover using the Minerva’s particle pulse-jets on back and behind the lower legs, somersaulting to the side as the Golem finishes charging the cannons.

*BZUUSH*

Merciless to anything standing in its path, the Golem’s particle beams instantly incinerates the boulder upon impact leaving Inami with barely any options for cover. At this point, he grows anxious as he notices that the other blip has already escaped the Minerva’s radar range while the Golem turns to him.

‘Damn it… At this rate, the Academy will—’

Inami jumps away from another incoming particle beam from the Golem as it tries to catch him off-guard. Knowing that the unmanned unit standing before him is holding him back, he’s left with no other choice but to take it on hoping that he would still have time to catch up with the other. He runs towards the Golem, firing his forearm particle gun blindly at it while keeping an eye on its charging particle cannons.

The Golem fires the cannons but Inami boosts himself up, dodging the particle beam by inches which graze the Minerva’s spherical particle barrier. He lands on the Golem’s massive forearm and uses it as a platform to launch himself onto its shoulders where he gets a clear line on the Golem’s head. With a hand clutching its bulky shoulder, he fires particle shots into its face and damages most of its visor that has multiple red eyes on it.

The drone retaliates, throwing its other arm to its shoulder and grabbing Inami via his lower body. The Golem’s big hand holds him firm and pulls him off its shoulder, throwing him away like a toy. He slams the ground hard but the Minerva armor absorbs the shock that he remained relatively unharmed. He realizes that unlike an IS, the Golem does not have a barrier to protect it from close-quarter attacks; the primary purpose of the Minerva given its armaments.

“Over here!”

With one remaining eye, the Golem furiously fire all particle cannons on both arm at Inami who’s rudely shocked by the sudden fit of rage the monstrosity has gone into as he runs around it trying to avoid the barrage of thick pink particle beams riddling a trail on the ground where he runs on.

Taking canon in account, that would be during the Academy's Class League Match. Then again, in Athena-verse, two Golems were sent instead of one. (One of them successfully reaching the Academy while the other... well, as above)

Athena-verse Golem Is have four particle cannons on each arm and they look similar to GFG's Protect Wall/Shade arm.