Should there be trouble

[AlexAD]

Hello.

'Robin reminded his men to keep their ears sharpened for the call of his horn, should there be trouble'.

Can I rewrite the highlighted part like 'if there should be trouble' and 'if there is trouble' ? Which of these sounds better for you?

Thanks, Alex.

[bhaisahab]

Hello.

'Robin reminded his men to keep their ears sharpened for the call of his horn, should there be trouble'.

Can I rewrite the highlighted part like 'if there should be trouble' and 'if there is trouble' ? Which of these sounds better for you?

Thanks, Alex.

All three are fine