Your first rule is conditional to the level of friendship.
If we're friends i'll use your tangles when needed, but if we're good friends i will go out of my way to use every single tangle available to make a beyblade, even if death is the ultimate result.
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I only use tangles as a sort of tangle debt to anyone where I then have to let them have one of mine. It also depends on how synergistic their build is e.g. if someone's using swarmers on warlock, they can have my tangles
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It's just a "rule" I've heard before in LFGs, so I used it as an example. It's not a rule I use actively in general. But now, like you, I shall make it a point to use every single tangle spawned from my friends. This is the way.