The beetles eating Gudbrand scatter only momentarily after Rowan's attack on the beetle in 0809, before returning to feed on Gudbrand's corpse. The remaining beetles rush the party, breaking against Rowan and Aleksandra, or circling the dead body towards Lothar. There are no attacks on Engelhart.
Aleksandra, against the wall, is attacked from the front by one beetle, in 0910: it rolls an 8, missing.
Rowan, facing 0809 after killing the last beetle, is attacked on the right by 0909 and on the flank by 0910. The flanking beetle attacks first, rolling a natural 1. Rolling to see if it damages itself, I discover that it does not. The other beetle rolls a 13, that being enough to hit Rowan. The druid takes 5 damage, driving it back into 0710.
That puts Rowan at -5 hit points. I will need a d20 roll from Rowan that is not an attack roll this round.
Finally, against Lothar. The beetle in 0709 expends its whole movement getting to that hex, so it makes no attack on Lothar this round. However, flanking Lothar is a beetle in 0609, and he is attacked from the right by the beetle in 0808. The flanking beetle attacks first, rolling a 13 and hitting Lothar, causing 6 damage and knocking him into hex 0707. The beetle in 0808 then turns and attacks him, rolling a 9 and missing.
Here is the placement of characters following the beetles' move:
That is the beetles' round. Rowan needs to roll his wisdom check, while Aleksandra and Engelhart can take action. Rowan and Lothar are stunned this round.
Here is where the party's experience stands at this moment: