Become a Magical Girl is the second stage in Puella Magi Madoka Magica.
Battleground
A few of Those Guys are spawned after 20 seconds. After 40 seconds, Baa Baa will start spawning, followed by more of Those Guys.
When the enemy base is damaged, Kyubey, Snache and Pigge are spawned with a boss shockwave.
Reference
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