Samuel MERRYLEES

Stabbed by another gunner in the groin with a sword bayonet which severed a major artery.

I assume the stabbing was intentional?
Do we know any more about the incident?

unfortunately I do not have any more info.

He is listed on all the burial sites as Samuel MERRYLEES, I was unable to locate any info other than below:

The Regiments of The Malta Garrison, The Royal Artillery.
The RA had an average strength of 1062 men. It had 690 admissions (649.7/1000 mean strength) into hospital with 16 deaths (15.06 deaths/1000 mean strength).
30 invalids returned to England.

Its average constantly sick was 53.26 (50.15/1000 mean strength). The average sick time to each soldier was 8.30 days. The average duration of cases of sickness was 28.17 days.

The RA had the highest death rate in the command attributable to three deaths by violence out of hospital. An artillery men (sic) who had been missing for some days was found drowned. A soldier rolled off the top of St James' Cavalier, while sleeping on the roof of his barrack room. Cpl Samuel Merrylees bled to death from a severed external iliac artery when stabbed in the groin with a sword bayonet by a gunner.
maltaramc.com/regmltgar/royalart.html