When Moira went live on the PTR, players rushed at the chance to get to know Overwatch's latest hero. This clip by ​Reddit user JamesGPeach of EvilToasterOW's stream shows him testing out Moira and how her abilities work against different characters.

Genji's Deflect can be used against a large number of abilities, not just guns. When Moira cast her healing orb in Genji's direction, it healed her. But, when it made its way towards him, Genji was able to Deflect it back and take the healing for himself. This means that Moira's healing orb can become an enemy's healing orb if a Genji manages to Deflect it. 

If this is true, that means that if Moira casts her Biotic Orb and chooses to do damage instead of healing, a Genji will be able to Deflect that, too. The orb will cause damage towards to Moira and her teammates if they are within range of the orb.

Knowing this bit of information is definitely helpful for those who want to play her once she officially goes live. For our sake, I hope it happens soon!