 Still not enough. single modded legendary mob should not instantly break free of a net when it's at 00% life (lvl 00 zone lvl 00 net). Most builds leveling up CAN NOT hit that monster again without killing it. The mechanic is fundamentally broken. Instead no stun/root should take place and the net should apply 000% (if your net is in range), but it can break free if you don't do enough dmg.    This encounter was after this hotfix was posted. Many worse encounters happened prior, especially with double modded legendary beasts, but left those out for obvious reasons. 