What kind of transformation Trunks used in Dragon Ball Super when fighting Vegeta?


In episode 54 of Dragon Ball Super (original air date, August 7):

> Trunks uses some kind of transformation. After transformed SSJ2, his hair
> grows, electricity sparks disappear, and his muscles grow. It looks similar
> to the USSJ (Super Saiyan 1 third grade) but now he has short hair, so could
> his hair grows like if he were transforming into a SSJ3? Is this a kind of
> new transformation or what?




Most likely it was the fondly nicknamed Super (or ultra) transformation. The
wiki calls it the
[Second](http://dragonball.wikia.com/wiki/Super_Saiyan_Second_Grade) Grade and
[Third](http://dragonball.wikia.com/wiki/Super_Saiyan_Third_Grade) Grade. It
is simply turning power into Muscle mass, which greatly enhances strength, but
the bulk lowers speed. Vegeta, Trunks, and Goku learned and used this
transformation in the Cell Saga. Vegeta and Trunks specifically used this to
beat down Cell in his second form, before Vegeta helped him obtain 18 and get
his perfect form.




Most likely it was the fondly nicknamed Super (or ultra) transformation. The
wiki calls it the
[Second](http://dragonball.wikia.com/wiki/Super_Saiyan_Second_Grade) Grade and
[Third](http://dragonball.wikia.com/wiki/Super_Saiyan_Third_Grade) Grade. It
is simply turning power into Muscle mass, which greatly enhances strength, but
the bulk lowers speed. Vegeta, Trunks, and Goku learned and used this
transformation in the Cell Saga. Vegeta and Trunks specifically used this to
beat down Cell in his second form, before Vegeta helped him obtain 18 and get
his perfect form.

