"Our vessel can be used for warfare," Sariel says carefully, "and has been, though we would prefer it weren't. Starfleet is an organization of explorers." Not that the Enterprise hasn't had her share of skirmishes. Sariel's expression might speak to this, even if she doesn't do the same aloud.

Beat. "That degree of unmonitored time travel? Is that safe?" She doesn't say 'is that wise'. All other reasons aside (not her place to go that far without further knowledge), Leela essentially did that much a second ago.