Only to counter an attack and regain health. You can prevent the attack within the post, but the Signature attack would've still had you starting out with 8 hp. If the Warhound attacked again before you used a defense and regained health then I just read it wrong...
The Warhound would have attacked, but couldn't due to Streak's Speed. She took 2 damage from attacks which didn't connect and recovered 4 health for her two defence moves, so overall she regained 2 health, bringing her back upto 10.
Hopefully I've got a handle on this now, but correct me if I'm wrong.
Streak's 9 Speed means she can attack a maximum for five times each turn. If she uses a Special attack (one listed on her stat card) then her opponent must use either a Special defence (one listed on their attack card) or a Signature defence to block it. If she uses a Signature attack the opponent can only block it with a Signature defence.
Special attacks can be used any number of times during a battle, Special defences can only be used twice per battle, and Signature attacks and defences can only be used once per battle. Also the same Special attacks cannot be used more than once in the same turn, but Special defences can be, although they would then be totally exhausted at the end of the turn.
Since Streak's IQ is <6 her Signature attacks cause twice the basic rate of damage, and since Streak's Strength is <6 her base damage is only 1 Health per attack.
Which means the breakdown of the stat card would be:
- IQ
Determines power of Signature abilities. Signature Attacks cause double damage for 1-5 and triple damage for 6-10. Signature Defences recover double health for 1-5 and triple health for 6-10. - Strength
Determines power of basic and Special attacks. Attacks cause 1 point of damage for 1-5 and 2 points of damage of 6-10. - Speed
Determines the total number of attacks a character can make per post, as well as the power of their defensive moves. 3 Attacks for 1-3, 4 attacks for 4-7 and 5 attacks for 8-10. Character recover 1 health when defending with Speed 1-5 and 2 health when defending with Speed 6-10. - Attack
Determines the number of Special Attacks a character may have. Attacks upgraded to Special Attacks may only be blocked by an opponent's Special Defences. There is no limit on the number of times a Special Attack may be used in a battle, but each Special Attack may only be used once per post. Special Attacks cause damage based on the character's Strength. - Defence
Determines the number of Special Defences a character may have. Special Defences may be used to counter enemy Special or basic attacks and recover health based on the character's Speed. Each Special Defence may only be used twice per battle, but may be used twice in a single post. - Health
Represents the character's ability to remain fighting, and is reduced as damage is taken. Health is calculated by combining the characters IQ, Strength, Speed and Defence, but does not include their Attack.