chong

No, that is not burned. But because you cut some of the roots, those that were cut ceased to provide nutrients to the leaf, causing the remaining roots to spread out their resources. And because there weren't as much root to supply them as before, the fringes of the leaves are not satisfied, hence, they die out. Since you want to have the plant grow more roots than leaves, after "root pruning" you needed to place the plant in only a warm, medium bright area, with high humidity.

Putting it in a bright area will cause the leaves to naturally accelerate photosynthesis. Just like a car, this will require a lot of (fuel) moisture in their system to accomplish this, and since there is not enough due to the missing roots, the nutrients only go so far in "mileage", and the remaining leaf ends dry out.

To begin with, since you were moving the plant to a bigger container, there was no need to trim the roots, regardless of entanglement. The roots have their "assigned" destination within the plant. Because the mother plant and the pups are all connected, they draw nutrients from each other. Had you wanted to separate the pup from the mother, then all you needed to do was divide the pup from the mother, taking great care so that damage to the roots is minimal. Here again, naturally, some collateral damage will occur to the roots. After re-potting, place plants in a warm, medium bright area, and high humidity as earlier mentioned.