Soap and the rest of TF141 had been sent on an evade of an abandoned lab... They each split up, Soap being sent to where live experiments were kept.

As he entered, he was quickly shot and stabbed in the chest, immediately feeling the life drain out him... Until he woke up somewhere, in a bed...

You stood over him, you had your wrist to his mouth as he seemed to be drinking your blood, however wierd it sounds... Your blood seemed to be healing him... He looked up at you, terrified.