There is a special non-manual marker found in interrogative subordinate clauses that are the direct objects of ask. This non-manual marker is head backward, and it is found in subordinate clauses that are cast both as indirect and direct speech. This marker is the same as that found in wh-constructions that are simplex clauses [Syntax - 1.2.3.4.]:
hs
re
hp-b ht-l
H1: [what there_ฤฑs] wonder
H2: ฤฑx
(adapted from Hakgรผder 2015a: 103; ex. 99)