No, not Bob/Faw on his own...it's too dangerous.
Solstice has already used up Slay. Surely he can't have two?
Also, Sam can't go SW, but your moves are basically S, SW so it doesn't matter.

Scenario 1:
Round 1
Us.
Bob/Faw: NW, W, attack Solstice. 3 damage done.
Fooruman: Ramming speed, attack Solstice. 6 damage done.
Grandma: W.
Sam: S, SW.
Shuriken: Attack box. Box has 20HP.

Him.
ICE HYDRA: N, attack Bob/Faw. Bob/Faw have 18HP.
Solstice: Attack Fooruman. Fooruman has 6HP.

Round 2
Us.
Bob/Faw: Cast Heal on Fooruman, attack ICE HYDRA. Fooruman has 16HP.
ICE HYDRA dies.
Fooruman: Attack Solstice. 2 damage done.
Grandma: Defend.
Sam and Shuriken: Attack box. Box has 12HP.

Him.
Solstice: Attack Bob/Faw. Bob/Faw have 4HP.

Round 3
Us.
Bob/Faw: W, attack Solstice. 3 damage done.
Fooruman: W, heal on Shuriken, attack Solstice. 2 damage done.
Grandma: W.
Shuriken and Sam: Attack box. Box has 4HP.

Him.
Solstice: Attack Bob/Faw.
Bob/Faw dies.

Round 4
Us.
Grandma: Attack Solstice. 3 damage done.
Fooruman: Attack Solstice. 2 damage done.
Shuriken: Attack box.
Box is destroyed.
Sam: 2xE.

Him.
Solstice: Attack Fooruman. Fooruman has 9HP.

Round 5
Us.
Grandma: Attack Solstice. 3 damage done.
Fooruman: Attack Solstice. 2 damage done.
Shuriken: 2xE, NE, N.
Sam: Defend.

Him.
Solstice: Attack Fooruman. Fooruman has 2HP.

Round 6
Fooruman: Foshzzle on Solstice, then attack Solstice. 20 damage done.
Grandma: Attack Solstice. 3 damage done.
Shuriken: 2xN.
Sam: Defend.

Results: Solstice and ICE HYDRA die. We win.

Scenario 2:
Round 1
Us.
Bob/Faw: NW, W, attack Solstice. 3 damage done.
Fooruman: Ramming speed, attack Solstice. 6 damage done.
Grandma: W.
Sam: S, SW.
Shuriken: Attack box. Box has 20HP.

Him.
ICE HYDRA: Defend.
Solstice: Attack Fooruman. Fooruman has 6HP.

Round 2
Us.
Bob/Faw: Cast Heal on Fooruman, defend. Fooruman has 16HP.
Fooruman: Attack Solstice. 2 damage done.
Grandma: Defend.
Sam and Shuriken: Attack box. Box has 12HP.

Him.
Solstice: Attack Bob/Faw. Bob/Faw have 17HP.
ICE HYDRA: N, attack Bob/Faw. Bob/Faw have 11HP.

Round 3
Us.
Bob/Faw: W, attack ICE HYDRA. 6 damage done.
ICE HYDRA dies.
Fooruman: W, heal on Shuriken, attack Solstice. 2 damage done.
Grandma: W.
Shuriken and Sam: Attack box. Box has 4HP.

Him.
Solstice: Attack Fooruman. Fooruman has 2HP.

Round 4
Us.
Grandma: Attack Solstice. 3 damage done.
Fooruman: Foshzzle Solstice. Attack Solstice. 20 damage done.
Bob/Faw: Attack Solstice. 3 damage done.
Shuriken: Attack box.
Box is destroyed.
Sam: 2xE.

Results: Solstice and ICE HYDRA die. We win.