To put it out of it misery of course. The blood contained an animal enzyme.
Why use a silencer with a .22 anyway? If you are a gun expert as you purport to be then you will also know that they are so quiet that they do not need one in a case like this one. Indeed a silencer would make the weapon unwieldy.
Obviously you never handled a 22. The claim they are very quiet is not true. Such weapon would not routinely be sold with a suppressor if any of your claims were true.
The use of the suppressor in conjunction with subsonic ammunition accomplishes 3 things:
1) the shooter doesn't need to worry about causing hearing damage from firing the weapon
2) the recoil is even less
3) the target and other animals/people around will not be alerted or disturbed.
Animals that hear the shots are frightened which not only could spoil the shot itself but makes it harder to target other such animals if they are running around. Hearing loss is obviously something people would prefer to avoid. If it is being used to shoot peopel then obviously you don't want to aert others in the house that could be in a different room.
There are 2 difference sources of noise when a weapon is fired. There are the gases escaping and the sonic boom from the bullet leaving the weapon. Both sources of noise need to be addressed in order to quiet a weapon. Subsonic ammunition takes care of the snoic boom. A sound suppressor takes care of the gases. Both together make a weapon rather silent. Using only 1 or the other leaves the other source of noise so a loud crack would still be heard.
You keep talking about truth but you don't seem to have a good command of it.