火手 is read as かしゅ (kashu) and means stoker.
かしゅ
kashu
ひのて
attack
かじ
fire
かりょく
firepower
かようび
Tuesday
ひばな
spark
かよう
ひぐち
burner
ひもと
origin of a fire
かじば
scene of a fire
じょうず
flattery
かいて
buyer
おおて
force attacking the front of a castle