How to fix weird model malformations during animations?

[N'zoth]

Good dark day for all of us, I have an issue about this model that it seem good at (unanimated) mode but when you try to play all of its animations, there are weird stretches and shapes being left on.

Try to look at its wings and hands, it is flying but there are weird malformations and rubbery stretches that breaks the model. How do I fix this through mdlvis?

In more probability that I ever find a solution to this, I may be able to armorize this model very soon.

 

[Ustanak]

The mesh parts that stretch and are not moving are not connected to any/wrong bone/s. You need to select those vertices and attach them to the bone.

 

[N'zoth]

The mesh parts that stretch and are not moving are not connected to any/wrong bone/s. You need to select those vertices and attach them to the bone.

Thank you for the aid.