On Maya, when an enemy is Thoughtlocked, meleeing them does not properly activate the Backdraft bonus fire damage, or its burn effect.
(As a side note, Backdraft is kinda garbage. Five points in it gives you about 15% of your base damage as a melee bonus, not enhanced by any other melee boosts or blade accessories, etc. IE, if you’ve got any bonuses at all, it gets reduces to a 10% or lower bonus(or about 2% bonus melee damage per level). If you’d give it the Cloud Kill treatment, that would be most gentlemanly.)
EDIT: In further testing, it does not seem as if Chain Reaction functions on a thoughtlocked target, either. Bullets will not bounce off them, or towards them, while under the effect.
Also, it seems as if homing grenades will not target Thoughtlocked enemies, including transfusion grenades.