[X] Let's treat this thing with the respect it demands. Let's fight smart, and make sure to keep mind of how it moves and what it intends with those motions, so we can prevent such intent, and not get bitten again. -[X] Make mental notes to jot down later so your comrades and self know what to do when another one of these things shows up. It's new, it's dangerous, and information negates both of those. --[X] Whenever you make successful prediction with it off balance, go for the head. It obviously has good regeneration, but, nothing beats a headshot.
[X] Use a more esoteric strategy. -[X] Actually, it might be smart to target the heart, not the head. This thing doesn't follow the same rules as other zombies, so what's to say the brain is its weakness? It seems more similar to a vampire, so attempt to kill it like you would a vampire, not a zombie.
[X] Defend. Keep it at a distance and make sure it can't get a grip on you again. Wait for a clear opening to attack its head, and when the time comes- don't miss.