This is an example of Mime magic. The caster mimes being stuck inside a box and for the duration, they're inside a protective box. This produces an invisible force field around the caster. It's slightly wider and taller than the caster and square at the base.

DR 5 [10] 
    Force Field [+20%] 
    No Signature [+20%] 
    All-Out [-25%] 
        Mime box performance 
    Temporary Disadvantage (Absent-Mindedness) [-15%] 
    Terminal Condition (Caster Speaking) [-10%] 
    Magical [-10%] 
    Spell Components [-40%] 
        Must gesture with hands (Mime box performance) 
        Must wear a beret 
        Must wear white make-up on face 
Level 2 [20] 
    Increase DR by 5 [+25 base] 
Levels 3+ [+10/level] 
    Increase DR by 5 [+25 base]