Bills' Damar Hamlin Fully Participates in Practice for 1st Time Since Cardiac Arrest

Damar Hamlin was on the field with the Buffalo Bills for the start of mandatory minicamp on Tuesday.

ESPN's Alaina Getzenberg posted video of Hamlin with his helmet on and going through a full open practice for the first time since suffering cardiac arrest on Jan. 2.

Alaina Getzenberg @agetzenbergFor the first time in an OTA open to the media, Damar Hamlin wore his helmet and was a full participant in practice. Big step forward. pic.twitter.com/4NVoPBhgFI

Speaking to reporters on April 18, Hamlin explained he was diagnosed with "commotio cordis" when he collapsed on the field in the first quarter of a Bills-Cincinnati Bengals game on Jan. 2:

"It's a direct blow at a specific point in your…