If something distracts a character while they're doing something physically demanding, it's fair enough to demand a concentration or willpower check or something to maintain control and not injure themselves.

Handy things that can distract a character:

• A nearby pigeon is spooked with a huge flurry of wings.
• A cat hisses and bursts out of a dark corner.
• The character accidentally steps on a rattlesnake.
• An avalanche.
• A satellite falls on a nearby house.

Transcript

Luke: So, how exactly did I contact Vader?
Yoda: Forged in your past, this psychic connection must have been.
Yoda: Ever felt you knew what he was doing, what he was saying? When you had no reason for knowing?
Luke: Uh... sort of, but that was out of char—
Yoda: No!
Yoda: A reason for this, there is!
Luke: What? How?! I've never even met the guy!
Luke: And he said I killed his son! Was his son on the Peace Moon or something?
Luke: Wait, Princess is Vader's daughter...
Luke: Oh my god!!
Luke: I killed her brother!
[SFX]: Krunch! {Luke falls}
Yoda: Princess?
Luke: Senator Princess Organa...
Luke: She had blue milk too!
Luke: Her adoptive parents were giving it to her!
Luke: OH MY GOD!!!
Luke: She totally kissed me right on the mouth!