As Nir points out, your latest attempt is closer,

However, your description of your characters is vague.

You describe your lead character as ‘someone’ and you describe the antagonist as ‘ another’ … this really tells us nothing. You can give us a brief description without actually adding too many extra words to the logline. Here would be an example:

“When an accident leaves a nerdy student with the ability to manipulate fire. He must race to an ancient temple while avoiding a ruthless cult that wishes to use his abilities to awaken a long-dormant fire god.”