After verbs of perception in the main clause, the progressive particle pe can introduce a kind of relative clause with the object of the main clause functioning as the "semantic" subject of the relative clause:
Mon vwar Lea pe danse. (constructed by linguist)
[1SG see Lea PROG dance]
'I see Lea dancing.' OR: 'I see Lea who dances.'
Source: Bollée and Rosalie 1994: 138
Source: Bollée and Rosalie 1994: 208f.