https://www.baa.org/2021-boston-marathon-participant-waiver
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the B.A.A. does not assume responsibility for your health, safety, security, or support;
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the responsibility for medical costs of any kind associated with transport, care, and treatment lies with the participant;
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you will not compete in a manner which, in the judgment of the race officials, interferes with race operations, other participants, or the integrity of the competition;
Birddogger may get bumped by someone big running with Sinema. Running is dangerous.