The full text on Break Ward states:
"No Line of Sight required. May be used even when in the front arc of an enemy"
Break Ward is an Adjacent spell, so can only be used when next to a Ward and is permitted to be used when in an enemy front arc (i.e adjacent).
The reason for his +1 Silver Heart (Wound) value is due to him being human, it's a default Race based stat that applies to other human characters that being injured could affect.
It will impact him if played in a campaign scenario of your own where he is leveled up and were to ever come across a +1 Combat progression. He'd then have that reduced.
All that said, I think it is more for profile consistency rather than gameplay impact (or lack thereof).
Ah, didn't have the card in front of me and it was just something I was thinking about while at work. Thank you for your answer!