Learning the game's mechanics, making a Strategy and evolving
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you are always the main preds target, you can however body block using another student, you basically have to be physically touching them and positioning them between you and the pred to avoid getting eaten, if you successfully used the other student to bodyblock her from eating you you'll ahve a small window to run away while she ingests them, if she spots you before the other student inside her is digested she will move alot slower giving you an opportunity to break line of sight and hide(crouch behind stuff if you can) or alrenatively bait her into eating another student. Alternatively and this makes bella by far the easiest pred to deal with, hold an apple, she is the only pred that will not eat you if you are holding an apple she will instead consume the apple and any keys you happen to be holding.
its a bit rng you'll learn the map little by little until you know where they all spawn outside of rooms, one piece of advice i guerss would be to drop any purple keys you find outside rooms if you can't take them with you, same for apples gives you a reference that you have searched that room and have no need to re scan it. Obviously don't leave the room if you hear a pred very close. (disclaimer: this advice doesn't apply at all in nightmare mode since key dropping makes noise and preds will b line to any dropped item location if they're close enough to hear it)