some confusion about reducing and oxdizing agents

[TalinAagam]

the equation is

2HCl + H2O2 + MnO2 --> O2 + MnCl2 + 2H2O

now, as far as I can tell,

Mn Is being reduced from +4 to +2. so it is the oxidizing agent
but what about O2?
O2 in H2O2 is -1 and it goes to being -2 in H2O.
but the answer says that O goes from -1 to 0 (from H2O2 to the O2).

Can anyone tell me why the answer ignores the oxidation state of O in H2O?

Thanks.

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[MJS4878]

edit - sorry, misread your question

 

[TalinAagam]

edit - sorry, misread your question

any idea on how why they just don't talk about the -2 on O in H2O??

 

[deh2ase]

When H2O2 acts as a reducing agent O2 is evolved. Mechanistically, the oxygens from O2 were derived from H2O2. Whereas the O from H2O was derived from MnO2.